Integer Overflow in Firefox Graphics Component
CVE-2026-5732

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
7 April 2026

What is CVE-2026-5732?

This vulnerability arises from incorrect boundary conditions in the Graphics: Text component of Firefox. An integer overflow may occur, potentially leading to unexpected behavior or exploitation. It specifically impacts Firefox versions prior to 149.0.2 and Firefox ESR prior to 140.9.1, necessitating timely updates to mitigate potential risks.

Affected Version(s)

Firefox < 149.0.2

Firefox ESR < 140.9.1

Thunderbird < 149.0.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2017867
https://www.mozilla.org/security/advisories/mfsa2026-25/
https://www.mozilla.org/security/advisories/mfsa2026-27/

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

Sajeeb Lohani
.