PT-2026-40023 · Mozilla · Firefox

Ggwhyp · Published 2026-05-12 · Updated 2026-05-27 · CVE-2026-8391

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150.0.3

Description An issue exists within the JavaScript Engine component.

Fix

RCE

Buffer Overflow

XSS

Weakness Enumeration

CWE-20

CWE-119

CWE-79

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

CVE-2026-8391

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10864-1

Affected Products

Firefox

References · 118

• https://linux.oracle.com/errata/ELSA-2026-21382.html · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:21381 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10864-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8959 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:21382 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8391 · Security Note
• https://osv.dev/vulnerability/OESA-2026-2392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8401 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:21380 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8388 · Security Note
• https://errata.rockylinux.org/RLSA-2026:21378 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8946 · Security Note
• https://errata.rockylinux.org/RLSA-2026:21382 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8953 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-51 · Vendor Advisory