CVE-2026-12299

MEDIUM EPSS 11.6%
Published Jun 16, 20262w ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Jun 16, 2026 2w ago
Last Modified Jun 17, 2026 2w ago

Description

JIT miscompilation in the DOM: Core & HTML 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
5.4
Exploitability
2.8
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
11.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-843

Affected Products 5

VendorProductVersionRange
mozillafirefox* <115.37.0
mozillafirefox* <152.0
mozillafirefox*≥140.0  –  <140.12.0
mozillathunderbird* <152.0.0
mozillathunderbird*≥140.0  –  <140.12.0

References 6

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2043139
    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.