Use-After-Free Vulnerability in Firefox Affected by ImageLib Component
CVE-2026-2789

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-2789?

A use-after-free vulnerability exists in the Graphics: ImageLib component of Firefox, which could allow attackers to exploit memory space that has been freed previously. Affected versions include Firefox versions earlier than 148 and also specific versions of Firefox ESR. This vulnerability could lead to unexpected application behavior and potential data exposure. Users are advised to update their Firefox and Firefox ESR installations to mitigate these risks.

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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=2015179
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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