CVE-2026-16412 PUBLISHED

Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. 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 153 and Firefox ESR 140.13.

• Christian Holler, Frederik Braun, Justin Link, Simon Friedberger, Tom Ritter, Tom Schuster and the Mozilla Fuzzing Team

• Moderate-severity memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153
• High-severity memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153
• Low-severity memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153
• https://www.mozilla.org/security/advisories/mfsa2026-68/
• https://www.mozilla.org/security/advisories/mfsa2026-70/