AI BriefingFirefox 150 Major Security Fixes
·2026.04.23 08:01
Key point
Details of the large-scale security fixes included in Firefox 150 and Thunderbird 150 have been disclosed.
Details
Firefox 150, Thunderbird 150, and updates to the ESR line reflect numerous security vulnerability fixes.
- Security advisories with high-severity vulnerabilities have been posted for Firefox 150 and Thunderbird 150.
- The disclosed items include use-after-free, uninitialized memory, privilege escalation, information disclosure, and DoS issues.
- Some vulnerabilities also apply to Firefox ESR 115.35 / 140.10 and Thunderbird ESR 140.10.
- Mozilla explained that for some bugs there was evidence of memory corruption, and that with enough effort and the right conditions, remote code execution could be possible.
- Just from the provided list, the number of patched bugs reaches into the dozens, making this a fairly large-scale browser security update.
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