CVE-2026-92040 Use-after-free in the JavaScript: WebAssembly component

Description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 156	earliest → < 156	156
Thunderbird 156	earliest → < 156	156

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-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High