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HIGH

Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151

Published May 19, 2026

Description

Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Affected products

Remediation

Red Hat statement

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

Weaknesses (2)

CWE-119

Buffer Overflow

CWE-787

Out-of-bounds Write

References (12)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mozilla
Published May 19, 2026
Updated May 26, 2026
Reserved May 19, 2026
Link CVE-2026-8974
CISA Vulnrichment
Updated May 20, 2026
NVD
Status Modified
Modified Jul 23, 2026
Link CVE-2026-8974
Red Hat
Severity Moderate
Public date May 19, 2026
Links CVE-2026-8974 - Bugzilla
ENISA EUVD
Assigner mozilla
Published May 19, 2026
Updated May 26, 2026
Exploited since n/a
Link EUVD-2026-30922
EUVD-2026-30922