CVE-2026-8091NVD

Vulnerability Summary

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.

Severity Level

CRITICAL(9.8)

Published Date

May 7, 2026

Last Modified

Oct 26, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.47%Probability

Root Weakness (CWE)

CWE-754: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CWE-805: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Mozilla Firefox < 115.35.2
Mozilla Firefox >= 140.0 and < 140.10.1
Mozilla Thunderbird >= 140.0 and < 140.10.1

Patched Versions

Mozilla Firefox 115.35.2
Mozilla Firefox 140.10.1
Mozilla Thunderbird 140.10.1

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