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Mozilla: Anthropic's Mythos found 271 zero-day vulnerabilities in Firefox 150

BACKGROUND
1 SIGNALFIRST DETECTED 21 April 2026
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How the story developed
Other feeds and industry voices
7 May
Mozilla says 271 vulnerabilities found by Mythos have "almost no false positives"

The developer of Firefox says it has "completely bought in" on AI-assisted bug discovery.

REPORT · WHO · Ars TechnicaOPEN STORY
7 May
Security researchers at Mozilla say Anthropic's Mythos has unearthed a wealth of high-severity bugs in Firefox.

Security researchers at Mozilla say Anthropic's Mythos has unearthed a wealth of high-severity bugs in Firefox.

OPINION · WHAT · TechCrunchOPEN STORY
7 May
How Anthropic’s Mythos has rewritten Firefox’s approach to cybersecurity

Security researchers at Mozilla say Anthropic's Mythos has unearthed a wealth of high-severity bugs in Firefox.

REPORT · HOW · TechCrunch AIOPEN STORY
22 Apr
Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox

<table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1ssc2cv/mozilla_used_anthropics_mythos_to_find_and_fix/"> <img alt="Mozilla Used Anthropic’s Mythos to Find

OPINION · WHAT · singularityOPEN STORY
22 Apr
Anthropic’s “Mythos” AI Model got accessed by unauthorized users due to 3rd party data breach

<!-- SC_OFF --><div class="md"><p>Anthropic's new cybersecurity-focused Al, Mythos, was reportedly accessed by unauthorized users through a third-party vendor environment (Mercor)

OPINION · HOW · ArtificialInteligenceOPEN STORY
7 May
Firefox reports a massive April spike in security fixes after using Claude Mythos for bug hunting

<table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1t6rmrz/firefox_reports_a_massive_april_spike_in_security/"> <img alt="Firefox reports a massive April

OPINION · HOW · singularityOPEN STORY
Sources
Ars Technica

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