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9.8 Critical

CVE-2026-2796 JIT miscompilation in the JavaScript: WebAssembly component

Description

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 148	earliest → < 148	148
Thunderbird 148	earliest → < 148	148
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 6	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published February 24, 2026
Last modified July 15, 2026

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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