Integer Overflow Vulnerability in Firefox by Mozilla
CVE-2026-109730

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
13 October 2026

What is CVE-2026-109730?

A significant integer overflow vulnerability exists in the Graphics component of Firefox, impacting various versions. This flaw can lead to unexpected behavior and potential exploitation in affected systems. Users are advised to update their software to versions 158, 115.43 of Firefox ESR, or 153.5 of Firefox ESR to mitigate the risks associated with this vulnerability.

Affected Version(s)

Firefox 115.43

Firefox 153.5

Firefox 158

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2074896
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-107/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Robert Longson
.