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Mozilla: Anthropic's Mythos Found 271 Security Vulnerabilities in Firefox 150

Mozilla said the Firefox team patched 271 vulnerabilities found with early access to Anthropic's new model as AI bug hunting accelerates.

  • On Tuesday, Mozilla released Firefox 150, which includes protections for 271 vulnerabilities identified using early access to Anthropic's Claude Mythos Preview.
  • Firefox Chief Technology Officer Bobby Holley stated that emerging AI tools create a necessary 'bootcamp' for software, forcing developers to fix latent vulnerabilities before attackers exploit them.
  • Previously using Anthropic's Opus 4.6 model, the team found 22 bugs in Firefox 148, though AI currently cannot identify vulnerabilities that an elite human researcher could not.
  • Describing the vulnerability haul as 'light at the end of the tunnel,' Holley asserted that 'defenders finally have a chance to win, decisively' against cyber threats.
  • Because every piece of software has bugs now discoverable by AI, The Mozilla Foundation warned that all software must undergo this critical security transition.
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Wired broke the news in United States on Tuesday, April 21, 2026.
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