Use-After-Free Vulnerability in Firefox JavaScript Engine
CVE-2026-2786

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-2786?

A use-after-free vulnerability in the JavaScript Engine of Firefox could allow an attacker to exploit memory corruption issues. This flaw impacts versions of Firefox prior to 148 and Firefox Extended Support Release (ESR) versions prior to 140.8, potentially leading to unauthorized access or execution of arbitrary code. Users are encouraged to update their browsers to mitigate the risk associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Firefox ESR < 140.8

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013612
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/

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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