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8.6 High

CVE-2026-8958 Information disclosure, sandbox escape in the Security: Process Sandboxing component

Description

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Affected products and versions

Product Affected versions Fixed in
Firefox 151 earliest → < 151 151
Firefox 140.11 earliest → < 140.11 140.11
Thunderbird 151 earliest → < 151 151
Thunderbird 140.11 earliest → < 140.11 140.11

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-2026-118025 Other issue in the SVG component 8.8 High
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