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OpenAdvisories
Critical · 9.6 CVE-2026-124900 EUVD-2026-120927GHSA-4qpg-rxp6-fcj2

Sandbox escape due to use-after-free in the DOM: Service Workers component

Published Nov 10, 2026 · Updated Nov 10, 2026 · Assigned by mozilla

Vendor: Mozilla Product: Firefox Product: Thunderbird Package: mozjs102 Package: mozjs115 Package: mozjs38 Package: mozjs52 Package: mozjs68 Package: mozjs78 Package: mozjs91 Package: thunderbird Category: Browsers Ecosystem: Ubuntu

Description

Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160 and Thunderbird 160.

Affected products

VendorProductAffectedFixed
Mozilla Firefox — 160
Mozilla Thunderbird — 160

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS mozjs102 +1 No fix yet —
Ubuntu 22.04 LTS mozjs78 +3 No fix yet —
Ubuntu 20.04 LTS mozjs52 +1 No fix yet —
Ubuntu 18.04 LTS mozjs38 +1 No fix yet —

Advisories 1

References