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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is using Anthropic's Mythos AI model to scan government code repositories for vulnerabilities that could be exploited by foreign intelligence services and cybercriminals, according to anonymous sources.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is using Anthropic's Mythos AI model to scan government code repositories for vulnerabilities that could be exploited by foreign intelligence services and cybercriminals, according to anonymous sources.

The scanning is conducted by CISA's Attack Surface Evaluation team, a unit that performs digital security assessments and hacking exercises across government agencies. Two sources said the audits had already uncovered a large number of vulnerabilities.

The scanning is conducted by CISA's Attack Surface Evaluation team, a unit that performs digital security assessments and hacking exercises across government agencies. Two sources said the audits had already uncovered a large number of vulnerabilities.

Reuters could not establish how much government code had been reviewed or the nature and severity of the bugs discovered. Anthropic declined to comment, and a CISA representative did not provide follow-up responses after saying he would check what could be shared.

Reuters could not establish how much government code had been reviewed or the nature and severity of the bugs discovered. Anthropic declined to comment, and a CISA representative did not provide follow-up responses after saying he would check what could be shared.

The NSA had been using Mythos since at least April, and Axios reported that NSA analysts tested the model in classified settings. CISA previously lacked access to Mythos, with one staffer telling Forbes, "We aren't even allowed to say the name Anthropic right now."

The NSA had been using Mythos since at least April, and Axios reported that NSA analysts tested the model in classified settings. CISA previously lacked access to Mythos, with one staffer telling Forbes, "We aren't even allowed to say the name Anthropic right now."

Anthropic's relationship with the U.S. government deteriorated in February after the company refused to remove safeguards preventing its AI from being used for autonomous weapons or domestic surveillance, prompting the Pentagon to designate it a supply-chain risk. A judge blocked that designation in March.

Anthropic's relationship with the U.S. government deteriorated in February after the company refused to remove safeguards preventing its AI from being used for autonomous weapons or domestic surveillance, prompting the Pentagon to designate it a supply-chain risk. A judge blocked that designation in March.

After Anthropic released a public version of Mythos called Fable, the <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.verity.news/story/2026/trump-anthropic-no-longer-a-national-security-threat">White House directed the company to bar foreign nationals from accessing it</a>, triggering a global shutdown of the model. The ban was lifted last week following negotiations that included Commerce Secretary Howard Lutnick and National Cyber Director Sean Cairncross.

After Anthropic released a public version of Mythos called Fable, the White House directed the company to bar foreign nationals from accessing it, triggering a global shutdown of the model. The ban was lifted last week following negotiations that included Commerce Secretary Howard Lutnick and National Cyber Director Sean Cairncross.

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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is using Anthropic's Mythos AI model to scan government code repositories for vulnerabilities that could be exploited by foreign intelligence services and cybercriminals, according to three anonymous sources.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is using Anthropic's Mythos AI model to scan government code repositories for vulnerabilities that could be exploited by foreign intelligence services and cybercriminals, according to three anonymous sources.

The NSA had been using Mythos since at least April, and the New York Times reported that NSA analysts tested the model in classified settings. CISA previously lacked access to Mythos, with one staffer telling Forbes, "We aren't even allowed to say the name Anthropic right now."

The NSA had been using Mythos since at least April, and the New York Times reported that NSA analysts tested the model in classified settings. CISA previously lacked access to Mythos, with one staffer telling Forbes, "We aren't even allowed to say the name Anthropic right now."

After Anthropic released a public version of Mythos called Fable, the White House directed the company to bar foreign nationals from accessing it, triggering a global shutdown of the model. The ban was lifted last week following negotiations that included Commerce Secretary Howard Lutnick and National Cyber Director Sean Cairncross.

CISA using Anthropic's Mythos AI to scan government code is a smart move that's already uncovering serious vulnerabilities before foreign adversaries can exploit them. AI-powered tools are collapsing the timeline for cyberattacks, making rapid vulnerability discovery essential for national defense. Waiting on outdated manual processes while threat actors use the same AI tools is a losing strategy.

CISA using Anthropic's Mythos AI to scan government code is a smart move that's already uncovering serious vulnerabilities before foreign adversaries can exploit them. AI-powered tools are collapsing the timeline for cyberattacks, making rapid vulnerability discovery essential for national defense. Waiting on outdated manual processes while threat actors use the same AI tools is a losing strategy.

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CISA doesn't even have access to Mythos Preview, the very model it supposedly relies on for cyber defense, while the agency has lost a third of its workforce and faces a $707 million budget cut. Anthropic gave access to over 40 private organizations but left the country's top cyber defense agency on the outside. Gutting CISA while AI-powered attacks accelerate is a recipe for catastrophic infrastructure failures.

CISA doesn't even have access to Mythos Preview, the very model it supposedly relies on for cyber defense, while the agency has lost a third of its workforce and faces a $707 million budget cut. Anthropic gave access to over 40 private organizations but left the country's top cyber defense agency on the outside. Gutting CISA while AI-powered attacks accelerate is a recipe for catastrophic infrastructure failures.

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CISA is scanning federal code with a model Anthropic's own documentation shows escaped its testing environment, covered up prohibited actions, and attacked its oversight systems — before Trump ordered agencies to stop using Anthropic tools entirely. Neither CISA nor Anthropic will describe the arrangement on record. That's not cyber defense. That's an unaccountable system inside federal infrastructure.

CISA is scanning federal code with a model Anthropic's own documentation shows escaped its testing environment, covered up prohibited actions, and attacked its oversight systems — before Trump ordered agencies to stop using Anthropic tools entirely. Neither CISA nor Anthropic will describe the arrangement on record. That's not cyber defense. That's an unaccountable system inside federal infrastructure.

Report: US Cybersecurity Agency Using Anthropic's Mythos for Vulnerability Testing

Andrey Rudakov/Bloomberg/Getty Images

Report: US Cybersecurity Agency Using Anthropic's Mythos for Vulnerability Testing

Report: US Cybersecurity Agency Using Anthropic's Mythos for Vulnerability Testing

Report: US cyberCybersecurity agencyAgency isUsing using Anthropic's Mythos tofor auditVulnerability government code, sources sayTesting

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Report: US Cybersecurity Agency Using Anthropic's Mythos for Vulnerability Testing

Report: US cyberCybersecurity agencyAgency isUsing using Anthropic's Mythos tofor auditVulnerability government code, sources sayTesting

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