CVE-2026-12291

HIGH EPSS 22.1%
Published Jun 16, 20262w ago · Modified Jun 18, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published Jun 16, 2026 2w ago
Last Modified Jun 18, 2026 1w ago

Description

Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
22.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 5

VendorProductVersionRange
mozillafirefox* <115.37.0
mozillafirefox* <152.0.0
mozillafirefox*≥128.0  –  <140.12.0
mozillathunderbird* <140.12.0
mozillathunderbird* <152.0.0

References 6

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2036929
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-57/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-58/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-59/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-60/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-61/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.