Integer Overflow Vulnerability in Firefox's ImageLib Component
CVE-2026-16402

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
21 July 2026

What is CVE-2026-16402?

An integer overflow vulnerability exists in the Graphics: ImageLib component of Firefox, potentially leading to unexpected behavior or exploitation. This issue has been addressed in Firefox version 153, which resolves the underlying flaw. Users are encouraged to update their browsers to the latest version to mitigate any risks associated with this vulnerability.

Affected Version(s)

Firefox 153

Thunderbird 153

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2052703
https://www.mozilla.org/security/advisories/mfsa2026-68/
https://www.mozilla.org/security/advisories/mfsa2026-71/

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

Kai Martin
.