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CVE-2026-8091

39
FAUCET Score

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.

First published: May 7, 2026Last modified: May 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 115.35.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
>= 140.0, < 140.10.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
>= 140.0, < 140.10.1CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
38.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 15th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

References

access.redhat.com / errata/RHSA-2026:26174
access.redhat.com / errata/RHSA-2026:26268
access.redhat.com / errata/RHSA-2026:26269
access.redhat.com / errata/RHSA-2026:26270
access.redhat.com / errata/RHSA-2026:26491
access.redhat.com / errata/RHSA-2026:26492
access.redhat.com / errata/RHSA-2026:26493
access.redhat.com / errata/RHSA-2026:26521
access.redhat.com / errata/RHSA-2026:26536
access.redhat.com / errata/RHSA-2026:26539
access.redhat.com / errata/RHSA-2026:26551
access.redhat.com / errata/RHSA-2026:26606
access.redhat.com / errata/RHSA-2026:26629
access.redhat.com / errata/RHSA-2026:26630
access.redhat.com / errata/RHSA-2026:27715
access.redhat.com / security/cve/CVE-2026-8091
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-8091.json
bugzilla.mozilla.org / show_bug.cgi
Permissions Required
mozilla.org / security/advisories/mfsa2026-30
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-33
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-36
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-39
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-42
Vendor Advisory