Integer Overflow Vulnerability in Firefox and Firefox ESR
CVE-2026-2774

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-2774?

An integer overflow vulnerability exists in the Audio/Video component of Firefox, affecting versions prior to 148 and specific Firefox ESR releases. This flaw can lead to unexpected behavior, potentially compromising user security. Users of these affected browsers are advised to update to the latest versions to safeguard their systems against potential exploits.

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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=2014883
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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