Log in Start free

Vulnerability · Published May 7, 2026 · Assigned by mozilla

CVE-2026-8091Incorrect boundary conditions in the Audio/Video: Playback component

Critical 9.8

In plain English

A critical-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 59.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10firefox140.10.1-1.el10_2ALSA-2026:19157
AlmaLinux:8firefox140.10.1-1.el8_10.alma.1ALSA-2026:19588
AlmaLinux:9firefox140.10.1-1.el9_8.alma.1ALSA-2026:19370
AlmaLinux:9firefox-x11140.10.1-1.el9_8.alma.1ALSA-2026:19370
AlmaLinux:10thunderbird140.10.1-1.el10_2.alma.1ALSA-2026:19153
AlmaLinux:8thunderbird140.10.1-1.el8_10.alma.1ALSA-2026:20586
AlmaLinux:9thunderbird140.10.1-1.el9_8.alma.1ALSA-2026:19348
Debian:12firefox-esr140.10.1esr-1~deb12u1DEBIAN-CVE-2026-8091
Debian:13firefox-esr140.10.1esr-1~deb13u1DEBIAN-CVE-2026-8091
Debian:14firefox-esr140.10.1esr-1DEBIAN-CVE-2026-8091
Debian:12thunderbird1:140.10.1esr-1~deb12u1DEBIAN-CVE-2026-8091
Debian:13thunderbird1:140.10.1esr-1~deb13u1DEBIAN-CVE-2026-8091
Debian:14thunderbird1:140.10.1esr-1DEBIAN-CVE-2026-8091
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8091
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8091
Ubuntu:24.04:LTSmozjs115no fix listedUBUNTU-CVE-2026-8091
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2026-8091
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2026-8091
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-8091

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-754, CWE-805 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References