CVE-2026-12297
CRITICAL severity · CVSS 9.6 · Memory corruption
9.6CVSS CRITICAL
Summary
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/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/mfsa2026-57/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-58/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-59/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-60/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2041610
- https://access.redhat.com/errata/RHSA-2026:27717
- https://access.redhat.com/errata/RHSA-2026:27733