Skip to content
Sign in
8.8 High

CVE-2025-10537 Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

Description

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 143 earliest → < 143 143
Firefox 140.3 earliest → < 140.3 140.3
Firefox ESR 140.3 earliest → < 140.3 140.3
Thunderbird 143 earliest → < 143 143
Thunderbird 140.3 earliest → < 140.3 140.3

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
Track this CVE