CVE-2025-4918

firefox: thunderbird: Out-of-bounds access when resolving Promise objects

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Severity

Important

Red Hat Product Security

8.8

CVSS 3.1

Review impact separately from score.

Published · May 18, 2025

Updated · June 28, 2026

Description

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object.

Statement

Red Hat Product Security rates the severity of this flaw as Important due to the requirement of user interaction.

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 currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.

CVSS / CWE

CVSS 3.1 · 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-787 · Out-of-bounds Write