Sandbox Escape Vulnerability in Firefox Graphics Component
CVE-2026-0879

9.8CRITICAL

Key Information:

Vendor

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

What is CVE-2026-0879?

This vulnerability involves a sandbox escape stemming from incorrect boundary conditions in the Graphics component of Firefox. It affects various versions of Firefox, including legacy ESR versions. This flaw may allow unauthorized access to system resources by breaking the intended security model of the browser.

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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=2004602
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-02/

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

Oskar L
JSON
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