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9.8 Critical

CVE-2026-16375 Site isolation issue in the Networking: HTTP component

Description

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Affected products and versions

Product Affected versions Fixed in
Firefox 153 earliest → < 153 153
Firefox 140.13 earliest → < 140.13 140.13
Thunderbird 153 earliest → < 153 153
Thunderbird 140.13 earliest → < 140.13 140.13

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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