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8.8 High

CVE-2025-8040 Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140

Description

Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. 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 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 141 earliest → < 141 141
Firefox 140.1 earliest → < 140.1 140.1
Firefox ESR 140.1 earliest → < 140.1 140.1
Thunderbird 141 earliest → < 141 141
Thunderbird 140.1 earliest → < 140.1 140.1

References

Timeline

  1. Published
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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-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High
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