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Cercle K2](https://cercle-k2.fr/storage/6341/conversions/raphael-caillet-k2-preview.jpg) ](#) [Raphaël Caillet](https://cercle-k2.fr/pt/users/single/1812/Rapha%C3%ABl-Caillet) 17/06/2026 - 12 min. de lecture - [](https://www.facebook.com/sharer/sharer.php?u=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock) - [](https://twitter.com/intent/tweet?text=Default+share+text&url=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock) - [](https://www.linkedin.com/sharing/share-offsite?mini=true&url=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock&title=Default+share+text&summary=) ![From Mythos to Fable 5: The Digital Pre-Shock - Cercle K2](https://cercle-k2.fr/storage/6643/conversions/raphael-caillet-k2-en-june-26-large.jpg) Cercle K2 neither approves or disapproves of the opinions expressed in the articles. Their authors are exclusively responsible for their content. [**Raphaël Caillet**](../../users/single/1812/Rapha%C3%ABl-Caillet) is an expert in cybersecurity and governance. \--- [***Read the French version here***](../../../etudes/mythos-fable-5-et-l-avant-choc-numerique-quand-l-ia-reduit-la-fenetre-de-defense) \--- Dangerous periods rarely begin with a single spectacular incident. They often begin when a technical issue stops belonging only to specialists and starts changing board decisions, public-policy assumptions, procurement rules, emergency procedures, and executive accountability. That is the right way to read the current AI-cyber moment: not as panic, not as prophecy, but as a shift in the strategic atmosphere. A recent French historical dossier asked whether we are now living through a pre-war period. Its contributors did not all reach the same conclusion. Some described a different kind of time. Others argued that Europeans are no longer fully living in peace. Others returned to a classical point often forgotten in comfortable periods: war is prepared for in order to try to prevent it.1 It would be excessive to transpose the notion of pre-war directly into cyberspace. But the analogy illuminates a central difficulty of our time. We live in an intermediate state made of permanent competition, economic pressure, information operations, cyberattacks, industrial dependencies, and weak signals. Peace does not vanish all at once. It is weakened layer by layer. France's 2025 National Strategic Review describes that inflection point. It highlights the lasting Russian threat, the disinhibition in the use of force, uncertainty around strategic solidarities, and the now-structuring role of artificial intelligence, cyber, space, quantum technologies, and electronic warfare. France's National Cybersecurity Strategy 2026-2030 extends that diagnosis: cyberspace has become an arena of competition, contestation, and sometimes confrontation, and the threat now affects the whole economic and social fabric.2 The European regulatory framework translates the same shift into the language of law and compliance. The NIS2 Directive begins with a simple observation: network and information systems have become essential to everyday life, the functioning of the internal market, and the continuity of critical sectors. It expands the scope of regulated entities and strengthens risk-management and incident-reporting obligations. For senior leaders, the message is direct: cybersecurity is no longer just a technical specialty. It now belongs to general governance, business continuity, and executive responsibility.3 In that context, Mythos should not be read as a mere technical improvement. It should be read as a signal. Mythos is an artificial-intelligence model developed by Anthropic and presented as particularly capable at identifying and exploiting software vulnerabilities. A so-called zero-day vulnerability is a flaw unknown to the vendor, or for which no patch is yet available. It is one of the most sensitive assets in the cyber domain because it allows an attacker to act before defenders have had time to organize. Anthropic stated that Mythos Preview showed a new ability to discover and exploit flaws in operating systems, browsers, and critical software. Project Glasswing then organized limited access to the model for organizations able to strengthen essential software components. The most important point is not the detail of each published figure. It is the direction of travel: detection can accelerate much faster than remediation.4 A subsequent development moved the issue into a different register. Anthropic announced Claude Fable 5, the public version of the Mythos line, presented as its most advanced model made more broadly available. That opening came with safeguards intended to prevent use in domains considered too risky, including cyber-vulnerability research. In other words, a capability derived from a model considered too sensitive to be freely released began entering the public space, but without the feature that made its cyber impact most visible.5 Fable 5 therefore does not contradict the Mythos warning. It confirms it in another form. Mythos showed that the capability exists. Fable 5 shows that access to that capability is a governance problem. The issue is no longer only what a model can do. It is who can access it, under what conditions, with what restrictions, under what data-retention rules, with what transparency around refusals, and with what responsibility if use becomes problematic. The Microsoft episode, reported the day after the Fable 5 announcement, is revealing in that respect. According to Reuters, Microsoft limited internal use of Fable 5 because of request-and-response retention requirements associated with Mythos-class models. This is not a commercial anecdote. When one of the world's largest digital companies hesitates to let its own teams use the most advanced model of a partner, trust is no longer reducible to performance. It also includes data-retention regimes, protection of secrets, intelligibility of safeguards, and the ability to audit what is being delegated.6 Then, on June 12, the debate changed scale. Anthropic announced that it had received a directive from the U.S. government, grounded in national-security authorities, ordering it to suspend all access to Fable 5 and Mythos 5 for any foreign national, whether located inside or outside the United States, including among its own employees. The practical effect was even more severe: to ensure compliance, the company disabled both models for all customers.7 The stated reason appears to have been a possible bypass of Fable 5's safeguards. Anthropic disputes the scope of that signal, which it describes as a narrow, non-universal jailbreak that identified a few minor and already known vulnerabilities. For our purposes, the decisive point is not to adjudicate that evidentiary dispute. It is to observe that access to a frontier model can now be interrupted within hours, not because of a technical outage or a commercial choice, but by sovereign decision. The shock is therefore no longer only about capability. It becomes legal, operational, and political. Mythos showed that AI could accelerate the discovery of vulnerabilities. Fable 5 showed that this capability could be made partially available under safeguards. The June 12 shutdown showed that it can also be abruptly withdrawn, including from partners that may have begun integrating it into defensive processes. For European actors, the signal is severe. Dependence no longer concerns only chips, cloud infrastructure, or model weights. It also concerns continuity of access, routing rights, fallback capacity, auditability of use, and the power to know who can switch off what, when, and why. Digital sovereignty becomes sovereignty of continuity. Here, one weakness in reasoning must be avoided. The existence of a capability, its general availability, its commercial governance, its appropriation by offensive actors, and its real integration into workflows are not the same thing. Mythos will not necessarily be in every attacker's hands tomorrow. Fable 5 is not Mythos without constraints. But the strategic question lies elsewhere: how long does it take for comparable, partial, bypassed, or reimplemented capabilities to enter market tools, cloud platforms, software-development chains, cybersecurity services, or offensive ecosystems? For a public or private decision-maker, the useful planning assumption is no longer several years. It is a matter of months. Three to six months should be treated as a planning assumption, not as a calendar certainty. Broad, public, and stable availability may take longer. But in national security, as in corporate risk management, prudence means preparing for the fast scenario rather than commenting on the comfortable one. What Mythos and Fable 5 change first is not only the power of attack. They change the time left for decision. Cybersecurity still rests on a human economy of time. A flaw must be discovered, understood, reported, qualified, assigned a level of criticality, patched, tested, deployed, and checked to ensure that the fix does not introduce new side effects. This cycle was already too slow for many organizations. It becomes insufficient when the search for flaws, their correlation, and sometimes their exploitation can be accelerated by specialized models. We should not yield to the fiction of omnipotent artificial intelligence. These systems make mistakes. They produce false positives. They still require human validation. They can be limited by their environment, access rights, data, and safeguards. But a technology does not have to be perfect to change a balance of power. It only has to make faster, cheaper, and more repeatable actions that previously required scarce skills. That displacement is major. Finding the flaw is no longer necessarily the sole bottleneck. The bottleneck shifts toward validation, prioritization, remediation, and deployment. Project Glasswing already illustrates this. Between what a model surfaces, what is confirmed, what is passed to maintainers, what is fixed, and what is actually deployed, there is an entire chain of delays, decisions, responsibilities, and sometimes blockages. The warning is therefore not only technical. It concerns the ability of organizations to absorb a new flow without collapsing into noise. A large company may have strong detection tools and remain vulnerable if it cannot arbitrate quickly. A public administration may have robust standards and remain exposed if its remediation circuits are too slow. A hospital may know its critical vulnerabilities and still be unable to fix them without risking continuity of care. A local authority may depend on a vendor or vertical software product without real control over its remediation timeline. In this regime, decision speed becomes a strategic asset. This is where Fred Raynal's analysis deserves serious attention. He points to congestion in coordinated vulnerability-disclosure channels - the pathways through which researchers report a flaw to a vendor before publication. He also points to the saturation of remediation channels, the sense of disregard some researchers may feel when dealing with vendors, and the risk that goodwill may gradually dry up. That goodwill is a discreet but essential element of collective security.8 Responsible disclosure has never been the most profitable choice. It rests on an implicit pact. The researcher agrees not to make a flaw public immediately. The vendor agrees to treat the report seriously, acknowledge it, and fix the problem within an acceptable timeframe. The ecosystem accepts that this imperfect but legitimate channel protects better than selling the flaw on gray or black markets. When this pact deteriorates, vulnerabilities do not disappear. They change channel. They circulate more silently. They can be sold, reserved, chained with other flaws, or integrated into offensive tools. The silence of the gray market is not a sign of security. It often means that information has left the visible space. Public signals already exist. GitHub recalled in May 2026 that vulnerability reports, whether produced by a researcher or assisted by an AI tool, must be validated before submission. HackerOne, one of the main vulnerability-reporting platforms, said it had observed an increase of more than 100 percent in report volume after the arrival of more advanced AI tools. The open-source cURL project ended its bug-bounty program in the face of a volume that had become too costly to absorb. Several recent episodes involving Microsoft and Visual Studio Code have shown how quickly the relationship between researchers and vendors can deteriorate when procedural trust disappears.9 These examples should not be turned into a blanket indictment of vendors. Major vendors absorb a considerable volume of reports, many of them incomplete, redundant, or erroneous. But the symptom is clear. When discovery capacity grows faster than triage and remediation capacity, trust itself becomes critical infrastructure. Mythos therefore arrives at the worst possible time for organizations that still treat vulnerability management as a technical back-office issue. Fable 5 adds another difficulty. The June 12 shutdown adds a third. Even when the capability is useful to defenders, its availability may depend on an external authority, a provider, and a cloud - in other words, on a chain the customer organization does not control. This finding directly concerns senior decision-makers. Digital transformation has long been presented as a lever for productivity, customer experience, public-sector modernization, and innovation. It is. But it has also built a deep dependence on software layers that few organizations truly master. Cloud services, application programming interfaces, open-source libraries, development tools, maintenance providers, payment platforms, digital-identity services, and collaboration tools have become the connective tissue of the state and the economy. This dependence is not necessarily bad. It enables speed, pooling, lower costs, and access to capabilities few actors could develop alone. It becomes dangerous when governance does not follow. A dependence that is assumed, mapped, and reversible can be mastered. An invisible dependence becomes a vulnerability. Digital sovereignty can therefore no longer be reduced to data localization or the nationality of suppliers. Those questions remain important, but they are not sufficient. In an age of models specialized in software security and of revocable access, sovereignty is also measured by the ability to preserve access to critical components, to understand quickly, qualify quickly, decide quickly, and repair quickly. A country or a large company that cannot absorb the acceleration of the cycle between discovery, exploitation, and remediation may still retain its standards, procedures, and dashboards. It nevertheless loses part of its freedom of action. The U.S. Executive Order of June 2, 2026, illustrates this awareness. It asks federal agencies to strengthen the cyber defense of their systems, provides for easier access by administrations, local authorities, and certain critical operators to advanced cyber tools, creates a coordination structure to identify, validate, prioritize, and distribute vulnerability fixes, and organizes a classified process to evaluate the cyber capabilities of the most advanced AI models.10 CISA's BOD 26-04 goes one step further. It starts in particular from the KEV catalog, the U.S. list of vulnerabilities known to be exploited. When one of those flaws gives full control of the system and affects an exposed asset or an attack path that can be automated by AI, the organization must no longer merely ask when it will patch. It must first ask whether it is already compromised. The fix remains indispensable, but it is no longer enough. It must be accompanied by forensic triage - a rapid examination of traces, a search for signs of intrusion, and, if necessary, containment. This is a major doctrinal shift. Patching ceases to be the closure of risk. It becomes one of the first acts in a possible incident response.11 The lesson is not that Europe should mechanically copy this response. The United States reasons in its own grammar, made of industrial primacy, voluntary cooperation with technology companies, protection of intellectual property, and direct defense of national interests. But its reaction says something essential. For Washington, AI models capable of acting on software security are no longer merely products. They become objects of national security, public-private coordination, and strategic competition. Another signal comes from China. With Kimi K2.6, Moonshot AI released an open, multimodal, and agentic model designed for long-horizon coding, autonomous execution, and sub-agent orchestration. The point is not to turn that model into a cyber threat by nature. It is to observe that the building blocks of coding, autonomy, and orchestration no longer remain confined to closed laboratories. They circulate in reusable, integrable, and adaptable models. Strategic competition is therefore also playing out in the diffusion of open capabilities that others can recombine - to defend, automate, develop, or attack.12 France and Europe must hear these signals. They have real assets: a culture of the state, a legal tradition, recognized cyber expertise, normative capacity, industrial and research actors, and a national cybersecurity strategy that places resilience at the heart of the 2030 ambition. But these assets will not be enough if they remain trapped in overly long cycles or overly sealed silos. The issue is not to publish a new doctrine at every disruption. It is to improve the maturity of decision. Digital is no longer a support function. It carries business continuity, the presence of the state, the quality of public service, customer trust, patient safety, payment fluidity, energy availability, transport robustness, and the credibility of institutions. A major cyber crisis is no longer merely an IT crisis. It is a crisis of authority, trust, and sometimes sovereignty. Another mistake must also be avoided. Faced with the acceleration of attack, the temptation will be strong to delegate everything to artificial-intelligence agents. An agent, in this context, is software capable of pursuing a task, using tools, taking intermediate decisions, and acting within a digital environment. Work carried out for several years on autonomous cyber-defense agents, notably within NATO, shows the value of systems able to perceive the state of an environment, plan a response, cooperate with other agents or with a command center, execute certain actions, and learn from experience.13 This path is necessary. In certain critical environments, isolated or subjected to a very high attack tempo, humans will not be able to handle everything manually. But autonomy is not an end. It is acceptable only if it remains bounded, traceable, reversible, and attached to clear human responsibility. The machine can accelerate defense. It must not dissolve decision. This is where the thread of the previous essay on cyber chaos and the strategic humanities reappears. Governing this world does not mean choosing between the engineer, the lawyer, the military officer, the executive, the communicator, or the financier. It means enabling these forms of knowledge to speak to one another without confusing them. The decision-maker does not need to become an expert in every protocol or every line of code. He or she must understand enough to arbitrate, prioritize, question, reject false certainties, and assume the political part of decision. Cyber thus brings us back to an old requirement: to decide without absolute certainty, to act without yielding to haste, to prepare without dramatizing, and to accelerate without abandoning judgment. In his work on major crises, Patrick Lagadec showed that the real danger is not only the event itself, but the inability to think the unknown when the usual maps no longer work. Mythos is not a megashock in itself. Nor is Fable 5. They point instead to a regime in which our trust circuits, remediation chains, and decision timelines may be overwhelmed before any spectacular event makes the rupture undeniable.14 It would therefore be imprudent to wait for the first major incident attributed to a model equivalent to Mythos before changing posture. The signals are already visible. States are beginning to organize access to the most sensitive models, and can now withdraw that access. Vendors are tightening reporting conditions. Bug-bounty platforms are adapting their processes. Open-source maintainers are warning about overload. Large companies understand that the issue is no longer only detection, but the ability to process the flow. We may be less in a pre-war period than in a pre-shock period. The expression is useful. It designates the moment when the signals are visible, when serious actors begin to organize, when dependencies appear, but when society still hesitates to scale up. That moment is short. It is also decisive. Preparing society, the state, and large organizations for the impact of Mythos, Fable 5, and their successors does not mean militarizing digital life. It means recognizing that software security, the quality of remediation, the integrity of disclosure, mastery of dependencies, the robustness of public services, the governance of artificial intelligence, and the continuity of major economic functions now belong to the same question: how can a free, open, and functional society be maintained when its digital environment becomes a permanent space of confrontation? The answer will not come from a single tool. Nor will it come from more reassuring communication. It will come from more demanding collective maturity. Public and private leaders will have to accept that digital has become a domain of concrete sovereignty. Boards will have to treat software vulnerability as a strategic risk. Public administrations will have to continue transforming their modes of decision. Companies will have to look at their dependencies not as architecture issues, but as conditions of continuity. Research communities must remain recognized as an advanced line of defense, not as noise to be managed. Mythos is not the end of a world. Fable 5 is not its reassuring normalization. The June 12 shutdown is not an administrative parenthesis. Together, they form a warning about the speed of what comes next. They remind us that the cyber question no longer consists only in protecting systems. It now consists in holding a society at machine tempo, without abandoning what still gives value to human decision. The test has already begun. [Raphaël Caillet](../../users/single/1812/Rapha%C3%ABl-Caillet) \--- **1.** L'Histoire, no. 544, June 2026, dossier "Nos avant-guerres," with, among others, Stephane Audoin-Rouzeau, Muriel Domenach, Bruno Cabanes, Pierre Schill, and Robert Frank. **2.** Revue nationale strategique 2025, SGDSN / Presidency of the French Republic, 2025; Strategie nationale de cybersecurite 2026-2030, SGDSN, January 29, 2026. These documents respectively present the strategic inflection point, the role of disruptive technologies, and the objective of first-rank cyber resilience. **3.** Directive (EU) 2022/2555 of the European Parliament and of the Council of December 14, 2022, known as NIS2, recitals 3 to 7. **4.** Anthropic, "Project Glasswing: Securing critical software for the AI era," April 7, 2026; Anthropic, "Claude Mythos Preview," April 7, 2026. These documents present the Glasswing program, controlled access to Mythos Preview, and the cyber capabilities highlighted by Anthropic. **5.** Deepa Seetharaman and Zaheer Kachwala, "Anthropic rolls out public version of Mythos without cybersecurity capability," Reuters, June 9, 2026. The article describes Claude Fable 5 as a public version of the Mythos line, with safeguards limiting certain cyber capabilities. **6.** Reuters, "Microsoft limits employee use of Anthropic's Claude Fable 5 over data retention concerns, The Verge reports," June 10, 2026. The article indicates that Microsoft reportedly limited internal use of Fable 5 because of the data-retention rules applicable to Mythos-class models. **7.** Anthropic, "Statement on the U.S. government directive to suspend access to Fable 5 and Mythos 5," June 12, 2026; Reuters, "Anthropic disables top-tier AI models after U.S. order limiting foreign access," June 13, 2026. These sources describe the U.S. directive suspending access to Fable 5 and Mythos 5 for foreign nationals, as well as the global disabling decided by Anthropic to ensure compliance. **8.** Fred Raynal, LinkedIn post on coordinated vulnerability disclosure and researcher-vendor trust: https://www.linkedin.com/posts/fredraynal\_10-chez-1password-1h-de-pr%C3%A9avis-chez-microsoft-activity-7469292774945771520-Twfy **9.** GitHub, "Raising the bar: Quality, shared responsibility, and the future of GitHub's bug bounty program," May 15, 2026; HackerOne, "Navigating the AI Wave: How We're Keeping Security Research Meaningful," May 29, 2026; Daniel Stenberg, "The end of the curl bug-bounty," January 26, 2026; The Record, "Researcher publishes GitHub token-stealing exploit, blames Microsoft's disclosure process," June 2026. **10.** White House, Executive Order "Promoting Advanced Artificial Intelligence Innovation and Security," June 2, 2026. **11.** CISA, Binding Operational Directive BOD 26-04, June 2026; Reuters, "U.S. shortens cyber fix window to three days as AI threats rise," June 10, 2026; Wired, "CISA Tells U.S. Agencies to Fix Security Bugs in Just 3 Days," June 2026. These sources present the shortening of remediation deadlines and the shift toward a presumption of compromise when an exploited vulnerability gives full control and affects an exposed asset or an attack path that can be automated. **12.** Moonshot AI, "Kimi K2.6," Hugging Face model card, April 2026. The card presents Kimi K2.6 as an open, multimodal, and agentic model oriented toward long-horizon coding, autonomous execution, and orchestration of tools or sub-agents. **13.** Paul Theron, Alexander Kott, Martin Drasar, Krzysztof Rzadca, Benoit LeBlanc, Mauno Pihelgas, Luigi Mancini, and Agostino Panico, "Towards an Active, Autonomous and Intelligent Cyber Defense of Military Systems: the NATO AICA Reference Architecture," ICMCIS / NATO STO IST-152, 2018. On the notion of "useful autonomy" applied to sovereign structures, see also Raphael Caillet, Concevoir, encadrer et eprouver des agents autonomes de cyberdefense dans les structures regaliennes a l'horizon post-quantique, professional thesis, Academie militaire de Saint-Cyr Coetquidan, 2025. **14.** Patrick Lagadec, Du risque majeur aux megachocs, Editions Preventique, 2012. 17/06/2026 - [](https://www.facebook.com/sharer/sharer.php?u=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock) - [](https://twitter.com/intent/tweet?text=Default+share+text&url=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock) - [](https://www.linkedin.com/sharing/share-offsite?mini=true&url=https://cercle-k2.fr/pt/etudes/from-mythos-to-fable-5-the-digital-pre-shock&title=Default+share+text&summary=) #### Últimas Publicações [ ![La poudre en onze mois. 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