CVE-2026-4729 PUBLISHED

Memory safety bugs fixed in Firefox 149 and Thunderbird 149

Assigner: mozilla
Reserved: 23.03.2026 Published: 24.03.2026 Updated: 24.03.2026

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 affects Firefox < 149.

Product Status

Vendor Mozilla
Product Firefox
Versions
  • affected from unspecified to 149 (excl.)

Credits

  • Christian Holler, Fatih Kilic, Tom Schuster and the Mozilla Fuzzing Team

References