PT-2026-40023 · Mozilla+1 · Firefox+1

Ggwhyp · CVE-2026-8391 · Published 2026-05-12 · Updated 2026-06-29

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

DoS

RCE

Buffer Overflow

XSS

Weakness Enumeration

CWE-20

CWE-119

CWE-79

CWE-475

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

ALSA-2026:22325

ALSA-2026:22643

CVE-2026-8391

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OESA-2026-2465

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10864-1

OPENSUSE-SU-2026:21168-1

RHSA-2026:26174

RHSA-2026:26268

RHSA-2026:26269

RHSA-2026:26270

RHSA-2026:26491

RHSA-2026:26492

RHSA-2026:26493

RHSA-2026:26521

RHSA-2026:26536

RHSA-2026:26539

RHSA-2026:26551

RHSA-2026:26606

RHSA-2026:26629

RHSA-2026:26630

RHSA-2026:27715

Affected Products

Firefox

Rocky Linux

References · 197

• https://access.redhat.com/errata/RHSA-2026:26270 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8947 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8388 · Security Note
• https://linux.oracle.com/errata/ELSA-2026-21381.html · Vendor Advisory
• https://errata.almalinux.org/10/ALSA-2026-22325.html · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:26539 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-45/#CVE-2026-8391 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-21382.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8391 · Security Note
• https://access.redhat.com/errata/RHSA-2026:21380 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-45 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:26268 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8391 · Security Note
• https://access.redhat.com/errata/RHSA-2026:26536 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2465 · Vendor Advisory