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7.5 High

CVE-2025-1931 It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a…

Description

It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

Affected products and versions

Product Affected versions Fixed in
Firefox 136 earliest → < 136 136
Firefox 128.8 earliest → < 128.8 128.8
Firefox 115.21 earliest → < 115.21 115.21
Firefox ESR 128.8 earliest → < 128.8 128.8
Thunderbird 136 earliest → < 136 136
Thunderbird 128.8 earliest → < 128.8 128.8

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