PT-2026-41916 · Mozilla+1 · Thunderbird+2

Manojkumar Jaganathan · Published 2026-05-19 · Updated 2026-06-02 · CVE-2026-8962

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 151 Firefox ESR versions prior to 140.11 Thunderbird versions prior to 151 Thunderbird versions prior to 140.11

Description A mitigation bypass exists within the DOM security component.

Recommendations Update to version 151 Update to version 140.11 Update to version 151 Update to version 140.11

Fix

DoS

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

ALSA-2026:22325

ALSA-2026:22643

CVE-2026-8962

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OESA-2026-2465

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10863-1

OPENSUSE-SU-2026:10864-1

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 143

• https://errata.rockylinux.org/RLSA-2026:21381 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8962 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8950 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-8962 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:21380 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8957 · Security Note
• https://errata.almalinux.org/8/ALSA-2026-22643.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-22643.html · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-21378.html · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:21382 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2392 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8968 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8974 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-51/#CVE-2026-8962 · Vendor Advisory