Use-after-free Vulnerability in Firefox WebAssembly Component
CVE-2026-2804

5.4MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2804?

A use-after-free vulnerability has been identified in the WebAssembly component of Firefox, which can lead to potential exploitation and security risks for users. This issue affects versions of Firefox prior to 148, where improper memory management allows access to previously freed memory, potentially enabling attackers to execute arbitrary code or crash the browser. Users are advised to update their browsers to the latest version to mitigate this risk.

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Affected Version(s)

Firefox < 148

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013584
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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