PT-2026-41928 · Mozilla+1 · Firefox+2

Nika Layzell + 3 · Published 2026-05-19 · Updated 2026-06-02 · CVE-2026-8974

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Firefox versions 140.10 through 150 Thunderbird versions 140.10 through 150

Description Memory safety bugs involving memory corruption could allow an attacker to run arbitrary code.

Recommendations Update Firefox to version 151 or ESR 140.11. Update Thunderbird to version 151 or 140.11.

Fix

DoS

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

ALSA-2026:22325

ALSA-2026:22643

CVE-2026-8974

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10863-1

OPENSUSE-SU-2026:10864-1

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 140

• https://nvd.nist.gov/vuln/detail/CVE-2026-8391 · Security Note
• https://errata.almalinux.org/8/ALSA-2026-22643.html · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:21378 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8959 · Security Note
• https://errata.rockylinux.org/RLSA-2026:21382 · Vendor Advisory
• https://errata.almalinux.org/10/ALSA-2026-21380.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-21382.html · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2392 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-46/#CVE-2026-8974 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8950 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-8974 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-51/#CVE-2026-8974 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10864-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:22643 · Vendor Advisory