CVE-2026-4729

Description

Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected Platforms

Weakness Type

CWE-120, CWE-825

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033%2C1997282%2C2009213%2C20…
• https://www.mozilla.org/security/advisories/mfsa2026-20/
• https://www.mozilla.org/security/advisories/mfsa2026-23/
• https://access.redhat.com/security/cve/CVE-2026-4729
• https://bugzilla.redhat.com/show_bug.cgi?id=2450745
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.json