CVE-2026-2766 - Vulnerability Analysis

Overview

Firefox < 148 and Firefox ESR < 140.8 contain a use-after-free vulnerability caused by improper memory management in the JavaScript Engine JIT component, letting attackers execute arbitrary code, exploit requires crafted JavaScript execution.

Severity & Score

Impact

Attackers can execute arbitrary code remotely, potentially leading to full system compromise.

Mitigation

Update to Firefox 148, Firefox ESR 140.8 or later.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2013583
• https://www.mozilla.org/security/advisories/mfsa2026-13/
• https://www.mozilla.org/security/advisories/mfsa2026-15/
• https://www.mozilla.org/security/advisories/mfsa2026-16/
• https://www.mozilla.org/security/advisories/mfsa2026-17/

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner