What’s Vulnerable › Vulnerabilities

CVE-2022-26486: Mozilla Firefox Use-After-Free Vulnerability

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-03-07
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-12-22 · updated 2026-08-19
• Weakness: CWE-416

Description

An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.

Affected products

• Mozilla Firefox: before 91.6.1; before 97.0.2 — fixed in 91.6.1, 97.0.2
• Mozilla Focus for iOS: before 97.3.0 — fixed in 97.3.0
• Mozilla Firefox for Android: before 97.3.0 — fixed in 97.3.0
• Mozilla Thunderbird: before 91.6.2 — fixed in 91.6.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 91.6.1, 97.0.2; Mozilla Focus for iOS 97.3.0; Mozilla Firefox for Android 97.3.0; Mozilla Thunderbird 91.6.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1758070
• https://www.mozilla.org/security/advisories/mfsa2022-09/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1758070
• https://www.mozilla.org/security/advisories/mfsa2022-09/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26486

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