PT-2025-26733 · Mozilla+5 · Thunderbird+6

Andrew Mccreight + 2 · Published 2025-06-24 · Updated 2026-02-02 · CVE-2025-6436

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Firefox versions prior to 140 Thunderbird versions prior to 140

Description: The issue is related to memory safety bugs that have been identified in Firefox and Thunderbird. These bugs have shown evidence of memory corruption, and it is presumed that with sufficient effort, some of these could be exploited to run arbitrary code.

Recommendations: For Firefox versions prior to 140, update to version 140 or later to resolve the issue. For Thunderbird versions prior to 140, update to version 140 or later to resolve the issue.

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALT-PU-2025-11100

ALT-PU-2025-11495

ALT-PU-2025-11497

ALT-PU-2025-14599

ALT-PU-2025-8725

ALT-PU-2025-9988

BDU:2025-07646

CVE-2025-6436

OPENSUSE-SU-2025:15325-1

OPENSUSE-SU-2025:15371-1

OPENSUSE-SU-2025:15383-1

SUSE-SU-2025:02339-1

SUSE-SU-2025:02529-1

SUSE-SU-2025:02546-1

SUSE-SU-2025_02339-1

SUSE-SU-2025_02529-1

USN-7991-1

Affected Products

Alt Linux

Astra Linux

Firefox

Linuxmint

Suse

Thunderbird

Ubuntu

References · 180

• https://ubuntu.com/security/CVE-2025-13015 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-0887 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11711 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2025-51 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2025-54 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2025-51 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-0891 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-14328 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02339-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15383-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-8039 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02529-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11715 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-8038 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-6434 · Vendor Advisory