PT-2026-41929 · Mozilla+1 · Firefox Esr+3

Andrew Mccreight + 3 · Published 2026-05-19 · Updated 2026-06-02 · CVE-2026-8975

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 Thunderbird versions 140.10 through 150 Firefox versions 150 and earlier Firefox ESR versions 115.35 through 140.10

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

Recommendations Update Thunderbird to version 151 or 140.11. Update Firefox to version 151. Update Firefox ESR to version 115.36 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-2026-8975

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

Firefox Esr

Rocky Linux

Thunderbird

References · 144

• https://errata.rockylinux.org/RLSA-2026:21381 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8950 · 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://mozilla.org/en-US/security/advisories/mfsa2026-48/#CVE-2026-8975 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8974 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8975 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-51/#CVE-2026-8975 · Vendor Advisory