Boundary Condition Fault in Firefox Graphics Component
CVE-2026-4713

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-4713?

The vulnerability arises from incorrect boundary conditions in the graphics component of Firefox, potentially allowing for improper memory handling. This affects versions prior to 149 and Firefox ESR versions below 140.9, exposing users to various security risks. Prompt updates are recommended to mitigate potential exploitation.

Affected Version(s)

Firefox < 149

Firefox ESR < 140.9

Thunderbird < 149

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2018113
https://www.mozilla.org/security/advisories/mfsa2026-20/
https://www.mozilla.org/security/advisories/mfsa2026-22/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sajeeb Lohani
.