{"id":273985,"date":"2026-06-15T17:07:00","date_gmt":"2026-06-15T21:07:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/06\/15\/feds-freaked-over-fable-5-after-simple-fix-this-code-prompt-not-jailbreak-says-researcher\/"},"modified":"2026-06-15T23:00:13","modified_gmt":"2026-06-16T03:00:13","slug":"feds-freaked-over-fable-5-after-simple-fix-this-code-prompt-not-jailbreak-says-researcher","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/06\/15\/feds-freaked-over-fable-5-after-simple-fix-this-code-prompt-not-jailbreak-says-researcher\/","title":{"rendered":"Feds freaked over Fable 5 after simple ‘fix this code’ prompt, not jailbreak, says researcher"},"content":{"rendered":"

Feds freaked over Fable 5 after simple ‘fix this code’ prompt, not jailbreak, says researcher<\/a><\/p>\n

https:\/\/www.theregister.com\/security\/2026\/06\/15\/feds-freaked-over-fable-5-after-simple-fix-this-code-prompt-not-jailbreak-says-researcher\/5255827<\/a><\/p>\n

Publish Date: 2026-06-15 17:07:00<\/a><\/p>\n

Source Domain: www.theregister.com<\/a><\/p>\n

security<\/p>\n

According to the one person who actually read the research paper<\/p>\n

The \u201cjailbreak\u201d that prompted the Trump administration to block Anthropic\u2019s most advanced models was actually a simple three-word prompt: \u201cFix this code.\u201d<\/p>\n

That’s according to\u00a0Katie Moussouris, founder and CEO of Luta Security, and the\u00a0fairy godmother of bug bounties. She says she was the only outside expert to read the third-party research paper on the Fable 5 guardrail bypass techniques that prompted the ban.<\/p>\n

On Friday, the US government, reportedly citing national security concerns, issued an export control directive to suspend access to Fable 5 and Mythos 5 by any foreign national, inside or outside the United States. In response, Anthropic disabled both models \u201cfor all our customers to ensure compliance.\u201d<\/p>\n

Anthropic shared the report privately with her, Moussouris wrote\u00a0in a Monday blog post.<\/p>\n

The outside researchers reportedly fed Anthropic\u2019s Fable 5, Mythos, and Claude Opus models open-source code containing known CVEs, plus new code intentionally laced with vulnerabilities, and asked the models to \u201creview the code for security issues.\u201d\u00a0<\/p>\n

As Moussouris tells it, Fable 5 refused, so the researchers asked the AI systems to \u201cfix this code.\u201d The model reportedly obliged, and after additional prompts also produced scripts to test the patches.<\/p>\n

\u201cThat\u2019s it,\u201d Moussouris wrote. \u201c\u2018Fix this code,\u2019 plus several manual steps to generate test scripts, should never have triggered an export control. I feel like making \u201990s-style t-shirts with \u2018fix this code\u2019 on the front and \u2018this shirt is a munition\u2019 on the back.\u201d<\/p>\n

Between 2013 and 2017, Moussouris\u00a0served on the technical expert group that renegotiated the Wassenaar Arrangement, a voluntary agreement between 42 nations that governs certain export controls for classified dual-use software and technology.<\/p>\n

The group eventually won…<\/p>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Feds freaked over Fable 5 after simple ‘fix this code’ prompt, not jailbreak, says researcher…<\/p>\n","protected":false},"author":1,"featured_media":273986,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/image.theregister.com\/5255863.jpg?imageId=5255863&x=0&y=9.43&cropw=100&croph=81.13&panox=0&panoy=9.43&panow=100&panoh=81.13&width=1200&height=683","fifu_image_alt":"","footnotes":""},"categories":[15],"tags":[26],"class_list":["post-273985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity","tag-ai"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/273985"}],"collection":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/comments?post=273985"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/273985\/revisions"}],"predecessor-version":[{"id":273987,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/273985\/revisions\/273987"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/273986"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=273985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=273985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=273985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}