Sandbox Escape Vulnerability in Firefox and Firefox ESR
CVE-2026-0880

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
13 January 2026

What is CVE-2026-0880?

A security flaw has been identified in the Graphics component of Firefox that allows for a sandbox escape due to an integer overflow. This issue impacts various versions of Firefox, specifically those prior to 147, as well as specific releases of Firefox ESR earlier than 115.32 and 140.7. Attackers may exploit this vulnerability to execute arbitrary code outside the intended security sandbox, compromising user safety and system integrity.

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Affected Version(s)

Firefox < 147

Firefox ESR < 115.32

Firefox ESR < 140.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2005014
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-02/

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

Oskar L
JSON
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