PT-2026-38429 · Mozilla · Thunderbird+2

Published 2026-05-07 · Updated 2026-05-07 · CVE-2026-8091

Positive Technologies (AI Summary)

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150 Thunderbird versions prior to 150 Firefox ESR versions prior to 140.10.2 Firefox ESR versions prior to 115.35.2

Description Incorrect boundary conditions exist in the Audio/Video: Playback component.

Recommendations Update to version 150 for Firefox. Update to version 150 for Thunderbird. Update to version 140.10.2 for Firefox ESR. Update to version 115.35.2 for Firefox ESR.

Related Identifiers

CVE-2026-8091

Affected Products

Firefox

Firefox Esr

Thunderbird

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-8091 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-41 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-42 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-36 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2029301 · Note