Mozilla Says Anthropic’s Mythos Found 271 Vulnerabilities in Firefox 150
Summary
Mozilla says Anthropic’s Mythos Preview helped identify 271 vulnerabilities in unreleased Firefox 150 source code, compared with 22 security-sensitive bugs found by Opus 4.6 in Firefox 148. Mozilla says AI could make vulnerability discovery more efficient.
Key points
- Mozilla says early access to Mythos Preview helped it identify 271 vulnerabilities in Firefox 150 before release.
- Mozilla CTO Bobby Holley said Opus 4.6 found 22 security-sensitive bugs in Firefox 148.
- Holley said Mythos analyzed unreleased Firefox source code; the article provides no details on the vulnerabilities’ severity.
- Mozilla says AI-assisted analysis could reduce the time and cost of finding software bugs, including in open-source projects with limited maintenance.
Article Details
- Event Type
- AI-assisted vulnerability discovery
- Impact
- Mozilla said Anthropic’s Mythos Preview helped identify 271 security vulnerabilities in Firefox 150 before its release. The article provides no severity breakdown and reports no exploitation of the vulnerabilities. Mozilla CTO Bobby Holley said the model reduced the effort needed to find bugs; he compared its results with 22 security-sensitive bugs found by Anthropic’s Opus 4.6 in Firefox 148.
People
Vendors
AnthropicEarlier this month, Anthropic said its Mythos Preview model was so good at finding cybersecurity vulnerabilities that the company was limiting its initial release to “a limited group of critical industry partners.”MozillaMozilla added some important data to that debate Tuesday, writing in a blog post that early access to Mythos Preview had helped it pre-identify 271 security vulnerabilities in this week’s release of Firefox 150.
Products
Claude Mythos PreviewEarlier this month, Anthropic said its Mythos Preview model was so good at finding cybersecurity vulnerabilities that the company was limiting its initial release to “a limited group of critical industry partners.”Mozilla FirefoxMozilla added some important data to that debate Tuesday, writing in a blog post that early access to Mythos Preview had helped it pre-identify 271 security vulnerabilities in this week’s release of Firefox 150.Opus 4.6But by way of comparison, he noted that Anthropic’s Opus 4.6 model found only 22 security-sensitive bugs when analyzing Firefox 148 last month.