CVE-2025-1942

firefox: Disclosure of uninitialized memory when .toUpperCase() causes string to get longer

Loading…

Severity

Moderate

Red Hat Product Security

6.3

CVSS 3.1

Review impact separately from score.

Published · March 4, 2025

Updated · November 21, 2025

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: When String.toUpperCase() causes a string to get longer, it is possible for uninitialized memory to be incorporated into the result string.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

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 · 6.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

CWE-824 · Access of Uninitialized Pointer