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Mozilla cites Mythos Preview finding 271 Firefox 150 vulnerabilities (unconfirmed)

Mozilla reports Mythos Preview identified 271 security vulnerabilities in Firefox 150 during early access, according to a company blog post.

Mozilla cites Mythos Preview finding 271 Firefox 150 vulnerabilities (unconfirmed)
via Ars Technica AI

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Anthropic's Mythos Preview is claimed to have identified 271 security vulnerabilities in Firefox 150 during Mozilla's early access. Mozilla CTO Bobby Holley highlighted a rising defender advantage in cyber security. Anthropic previously claimed Mythos Preview found 22 bugs in Firefox 148, suggesting improvements, though severity and scope are not detailed.

Lead coverage: Ars Technica AI — Mozilla: Anthropic's Mythos found 271 security vulnerabilities in Firefox 150 ↗

🕰 The timeline · 1 source

Ars Technica AI reporting rumored · 2d ago · 3/5

Mozilla: Anthropic's Mythos found 271 security vulnerabilities in Firefox 150 ↗

Anthropic's Mythos Preview is claimed to have identified 271 security vulnerabilities in Firefox 150 during Mozilla's early access. Mozilla CTO Bobby Holley highlighted a rising defender advantage in cyber security. Anthropic previously claimed Mythos Preview found 22 bugs in Firefox 148, suggesting improvements, though severity and scope are not detailed.

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Cluster ID
c7cb3bb70c
Importance (max)
3
Members
1
Sources
Ars Technica AI
Earliest
2026-04-21T21:40:41.000Z
Latest
2026-04-21T21:40:41.000Z
Lead URL
https://arstechnica.com/ai/2026/04/mozilla-anthropics-mythos-found-271-zero-day-vulnerabilities-in-firefox-150