CVE-2026-6751

April 22, 2026, 4:08 p.m.

7.3
High

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.

Product(s) Impacted

Vendor Product Versions
Mozilla
  • Firefox
  • Thunderbird
  • *
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-457
Use of Uninitialized Variable
The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a mozilla firefox / / / / esr / / /
a mozilla firefox / / / / - / / /
a mozilla thunderbird / / / / esr / / /

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2025883
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-32/
https://www.mozilla.org/security/advisories/mfsa2026-33/
https://www.mozilla.org/security/advisories/mfsa2026-34/

Tags

CWE-457
[email protected]
2026-04-21
CVE-2026-6751

CVSS Score

7.3 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Privileges Required: NONE
  • Scope: UNCHANGED
  • Confidentiality Impact: LOW
  • Integrity Impact: LOW
  • Availability Impact: LOW

    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

    View Vector String

Timeline

Published: April 21, 2026, 1:16 p.m.
Last Modified: April 22, 2026, 4:08 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.