PT-2026-41908 · Mozilla+1 · Thunderbird+2

Published 2026-05-19 · Updated 2026-06-02 · CVE-2026-8954

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 Incorrect boundary conditions lead to an integer overflow in the Audio/Video component. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of digits.

Recommendations Update to version 151 Update to ESR version 140.11 Update to version 151 Update to version 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-2026-8954

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10863-1

OPENSUSE-SU-2026:10864-1

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 141

• https://mozilla.org/security/advisories/mfsa2026-51/#CVE-2026-8954 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8962 · Security Note
• https://errata.almalinux.org/9/ALSA-2026-21381.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10863-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8975 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8957 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-8954 · Security Note
• https://ubuntu.com/security/CVE-2026-8954 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8401 · Security Note
• https://osv.dev/vulnerability/OESA-2026-2392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8947 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8974 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8959 · Security Note
• https://errata.rockylinux.org/RLSA-2026:21382 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:21381 · Vendor Advisory