CVE-2026-124882: Use After Free
Source GCVE Database
Not known to be exploited · CVSS 8.8 High.
Data as of 10 Nov 2026, 17:17 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 8.8 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
AI-suggested
Users should update Firefox to version 160 or later, or Firefox ESR to version 115.45 or later, where this vulnerability has been fixed. No additional mitigation actions are required beyond applying these official fixes.
Description
CVE-2026-124882 is a use-after-free vulnerability in the CSS Parsing and Computation component of Firefox. This flaw was addressed and fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating it can lead to significant impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users are advised to update to the fixed versions to mitigate the risk.
References
- nvd.nist.gov/vuln/detail/CVE-2026-124882 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=2081982 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-125 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-126 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-127 (opens in a new tab)