CVE-2026-6748

CRITICAL EPSS 30.7%
Published Apr 21, 20262mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Apr 21, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
30.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-457

Affected Products 3

VendorProductVersionRange
mozillafirefox* <140.10.0
mozillafirefox* <150.0
mozillathunderbird* <140.10.0

References 5

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2022604
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-30/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-32/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-33/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-34/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.