What is GHSA-29g5-92cf-qhwc?

GHSA-29g5-92cf-qhwc is a security advisory published by GitHub Security Advisories with Critical severity. Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability...

Which CVE IDs does GHSA-29g5-92cf-qhwc cover?

GHSA-29g5-92cf-qhwc covers the following CVE IDs: CVE-2026-100804. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-29g5-92cf-qhwc?

GHSA-29g5-92cf-qhwc has a CVSS v3 base score of 9.6, published by GitHub Security Advisories.

GHSA-29g5-92cf-qhwcCriticalCVSS 9.6

Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability...

Vendor

GitHub Security Advisories

Published

September 29, 2026

Last Modified

September 30, 2026

🔗 CVE IDs covered (1)

CVE-2026-100804 →

📋 Description

Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Firefox 157.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-100804
https://bugzilla.mozilla.org/show_bug.cgi?id=2058647
https://www.mozilla.org/security/advisories/mfsa2026-97
https://www.mozilla.org/security/advisories/mfsa2026-101
https://github.com/advisories/GHSA-29g5-92cf-qhwc