CVE-2026-6746
HIGH severity · CVSS 7.5 · Use-after-free
7.5CVSS HIGH
Summary
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2026-30/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-31/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-32/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-33/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-34/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2014596