Boundary Condition Vulnerability in Firefox and Mozilla’s Graphics: Canvas2D
CVE-2026-4706

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-4706?

This vulnerability arises from improper boundary conditions within the Graphics: Canvas2D component of the Firefox web browser. Affected versions include Firefox prior to version 149 and both Firefox ESR versions 115.34 and 140.9. Attackers could exploit this vulnerability to induce unexpected behavior, potentially leading to security risks for users.

Affected Version(s)

Firefox < 149

Firefox ESR < 115.34

Firefox ESR < 140.9

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2015091
https://www.mozilla.org/security/advisories/mfsa2026-20/
https://www.mozilla.org/security/advisories/mfsa2026-21/

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

Jun Yang
.