CVE-2026-4689

CRITICAL EPSS 47.6%
Published Mar 24, 20263mo ago · Modified Jun 17, 20261w ago
10.0 CVSS 3.1
Critical
Find Similar
Published Mar 24, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

Description

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS Details

Base Score
10.0
Exploitability
3.9
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
47.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 3

CWE-120
CWE-190 Integer Overflow or Wraparound Numeric Error
CWE-754

Affected Products 5

VendorProductVersionRange
mozillafirefox* <115.34.0
mozillafirefox* <149.0
mozillafirefox*≥128.0  –  <140.9.0
mozillathunderbird* <140.9.0
mozillathunderbird* <149.0

References 6

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2016374
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-20/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-21/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-22/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-23/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-24/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.