CVE-2026-8091 | Incorrect boundary conditions in the Audio/Video: Playback c… | CVSS 9.8 CRITICAL

Description

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

Metadata

CVE ID: CVE-2026-8091
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-05-07 12:45 UTC
Published: 2026-05-07 12:45 UTC
Last updated: 2026-07-22 12:08 UTC
Primary CWE: CWE-754
CWE-754 Improper Check for Unusual or Exceptional Conditions
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	115.35.2 ≤ 115., 140.10.1 ≤ 140., 150 ≤ *
Mozilla	Thunderbird	—	140.10.1 ≤ 140., 150 ≤

Weakness (CWE)

CWE	Source	Description
CWE-754	adp	CWE-754 Improper Check for Unusual or Exceptional Conditions
CWE-805	adp	Buffer Access with Incorrect Length Value

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5	HIGH	3.1	adp	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References (6)