JIT Miscompilation in JavaScript Component Affecting Mozilla Firefox
CVE-2026-2796

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2796?

A vulnerability has been identified in the JavaScript component of Mozilla Firefox, specifically related to JIT (Just-In-Time) miscompilation affecting versions prior to 148. This vulnerability could allow for unexpected behavior or potential exploitation due to the improper handling of WebAssembly. Users are advised to update their Firefox 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=2013165
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Information to follow
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