Use After Free Affecting Firefox-ESR package, versions [,140.6)
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Test your applications- Snyk IDSNYK-UNMANAGED-FIREFOXESR-14244043
- published9 Dec 2025
- disclosed9 Dec 2025
- creditIgor Morgenstern
Introduced: 9 Dec 2025
NewCVE-2025-14321 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade Firefox-ESR to version 140.6 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via the Signaling process in the WebRTC component. An attacker can execute arbitrary code or cause a denial of service by triggering use-after-free conditions during signaling operations.