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

arstechnica.com

CTO says new AI model is "every bit as capable" as world's best security researchers.

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Patch Tuesday, May 2026 Edition

Artificial intelligence platforms may be just as susceptible to social engineering as human beings, but they are proving remarkably good at finding security vulnerabilities in human-made computer code. That reality is on full display this month with some of the…

0 inbound links en Latest WarningsThe Coming StormTime to Patch AnthropicappleChris GoettlFirefox 150googleIvantimicrosoftMozillaOracleProject GlasswingRapid7sans internet storm center
May 15, 2026 - Schneier on Security

In this issue: Defense in Depth, Medieval Style Human Trust of AI Agents Mythos and Cybersecurity Is "Satoshi Nakamoto" Really Adam Back? Mexican Surveillance Company ICE Uses Graphite Spyware FBI Extracts Deleted Signal Messages from iPhone Notification Database Hiding Bluetooth Trackers in Mail Medieval Encrypted Letter Decoded What Anthropic’s Mythos Means for the Future of Cybersecurity Claude Mythos Has Found 271 Zero-Days in Firefox Fast16 Malware A Ransomware Negotiator Was Working for a Ransomware Gang Hacking Polymarket DarkSword Malware Rowhammer Attack Against NVIDIA Chips Smart Glasses for the Authorities Insider Betting on Polymarket LLMs and Text-in-Text Steganography Copy.Fail Linux Vulnerability OpenAI’s GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities How Dangerous Is Anthropic’s Mythos AI? Upcoming Speaking Engagements

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Patch Tuesday, May 2026 Edition

Artificial intelligence platforms may be just as susceptible to social engineering as human beings, but they are proving remarkably good at finding security vulnerabilities in human-made computer code. That reality is on full display this month with some of the…

2 inbound links en Latest WarningsThe Coming StormTime to Patch AnthropicappleChris GoettlFirefox 150googleIvantimicrosoftMozillaOracleProject GlasswingRapid7sans internet storm center
Schneier on Security
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Claude Mythos Has Found 271 Zero-Days in Firefox - Schneier on Security

That’s a lot. No, it’s an extraordinary number: Since February, the Firefox team has been working around the clock using frontier AI models to find and fix latent security vulnerabilities in the browser. We wrote previously about our collaboration with Anthropic to scan Firefox with Opus 4.6, which led to fixes for 22 security-sensitive bugs in Firefox 148. As part of our continued collaboration with Anthropic, we had the opportunity to apply an early version of Claude Mythos Preview to Firefox. This week’s release of Firefox 150 includes fixes for 271 vulnerabilities identified during this initial evaluation...

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