VulnerabilityPublished 22 Apr 2026

Claude Mythos Finds 271 Firefox Vulnerabilities

Source SecurityWeek

Severity

Medium

Rated by Threat Radar

Data as of 22 Apr 2026, 23:21 UTC

What to do

AI-suggested

Since no affected versions or patches are listed, users should monitor Mozilla's official security advisories for updates and apply any forthcoming patches promptly.

Description

All the flaws could have also been found by an elite human researcher, according to Mozilla. The post Claude Mythos Finds 271 Firefox Vulnerabilities appeared first on SecurityWeek .

Impact

The impact is currently unclear due to lack of detailed information on the vulnerabilities. No known exploits in the wild reduce immediate risk. The medium severity suggests potential security concerns but without specifics, the exact impact cannot be determined.

Summary

Claude Mythos discovered 271 vulnerabilities in Firefox, which Mozilla confirmed could also have been identified by an elite human researcher. The report does not specify the types of vulnerabilities, affected versions, or technical details. No exploits are currently known to be active in the wild. The vulnerabilities collectively have a medium severity rating, but no further technical data is provided.

References

securityweek.com/claude-mythos-finds-271-firefox-vulnerabilities/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 22 Apr 2026, 11:31 UTC

References

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