CVE-2026-100811

CriticalCVSS 9.6

Published: 29/09/2026(UTC)Updated: 29/09/2026(UTC)Translated: 29/09/2026(UTC)NVD NIST

Summary

Vulnerability allows sandbox escape due to use-after-free in the DOM: Core & HTML component. It was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

Risk Assessment

An attacker could exploit this vulnerability to escape the browser sandbox, potentially leading to system compromise.

Recommendation

Immediately update Firefox to ESR 153.4, 157, or ESR 140.17.

Other vulnerabilities in Firefox

See all

CVE-2026-96869Medium
Information disclosure in the Networking component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
CVE-2026-100832High
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
CVE-2026-100831High
Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100830Unknown
Mitigation bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100829Unknown
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100828Unknown
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100826Medium
Denial-of-service in the Storage: StorageManager component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100825High
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100824High
Privilege escalation in the Places component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
CVE-2026-100822Unknown
Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

Original NVD description (English source)

Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS