CVE-2026-8949

firefox: thunderbird: Integer overflow in the Widget: Win32 component

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · May 19, 2026

Updated · July 27, 2026

Description

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Integer overflow in the Widget: Win32 component

Statement

This issue only affected Firefox and Thunderbird builds for Microsoft Windows, builds for Linux were not affected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-190 · Integer Overflow or Wraparound