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CVE-2026-7320: Information disclosure due to incorrect boundary conditions in the Audio/Video component

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-28 · updated 2026-10-26
• Weakness: CWE-119

Description

Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

Affected products

• Mozilla Firefox: before 115.35.1; before 150.0.1; from 128.0 before 140.10.1 — fixed in 115.35.1, 150.0.1, 140.10.1
• Mozilla Thunderbird: before 140.10.1; before 150.0.1 — fixed in 140.10.1, 150.0.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.35.1, 150.0.1, 140.10.1; Mozilla Thunderbird 140.10.1, 150.0.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2027433
• https://www.mozilla.org/security/advisories/mfsa2026-35/
• https://www.mozilla.org/security/advisories/mfsa2026-36/
• https://www.mozilla.org/security/advisories/mfsa2026-37/
• https://www.mozilla.org/security/advisories/mfsa2026-38/
• https://www.mozilla.org/security/advisories/mfsa2026-39/
• https://access.redhat.com/errata/RHSA-2026:19153
• https://access.redhat.com/errata/RHSA-2026:19157
• https://access.redhat.com/errata/RHSA-2026:19348
• https://access.redhat.com/errata/RHSA-2026:19370
• https://access.redhat.com/errata/RHSA-2026:19588
• https://access.redhat.com/errata/RHSA-2026:20586

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