Use-After-Free Vulnerability in Firefox Audio/Video Playback Component
CVE-2026-2772

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2772?

A use-after-free vulnerability exists in the Audio/Video Playback component of Firefox, impacting specific versions of the browser. The issue arises when memory is accessed after it has been freed, potentially allowing attackers to execute arbitrary code or cause a crash. Users of Firefox versions prior to 148, and ESR versions prior to 115.33 and 140.8, are particularly at risk. It is crucial for users to update their browsers to mitigate the risks associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Firefox ESR < 115.33

Firefox ESR < 140.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2014827
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-14/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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