CVE-2025-10537

Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

• CWE-119

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1938220%2C1980730%2C1981280%2C1981283%2C1984505%2C1985067Issue Tracking
• https://www.mozilla.org/security/advisories/mfsa2025-73/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-75/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-77/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-78/Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html
• https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html

Published

Sep 16, 2025

Last Modified

Jun 17, 2026

Status

Modified

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