Boundary Condition Flaw in Firefox Graphics: Canvas2D Component
CVE-2026-4707

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-4707?

A vulnerability exists in the Graphics: Canvas2D component of Firefox due to incorrect boundary conditions. This weakness can be leveraged in various ways, potentially leading to unintended operations or crashes in affected versions of the browser. Users are encouraged to upgrade to the latest version to mitigate risks associated with this flaw.

Affected Version(s)

Firefox < 149

Firefox ESR < 115.34

Firefox ESR < 140.9

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2015267
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

Sajeeb Lohani
.