CVE-2026-74961: Side-channel in the Web Audio component

Critical severity · published Aug 18, 2026

CVE-2026-74961

Side-channel in the Web Audio component

9.1

CVSS

0.4%

EPSS

On KEV

Description

Side-channel in the Web Audio component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

High

Integrity

High

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 38% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Firefox · Mozilla

before 153.1.0; before 153.1.0 · source: NVD

Thunderbird · Mozilla

before 153.1.0; before 153.1.0 · source: NVD

Affected product

Firefox

Mozilla

All Firefox CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-74961

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-74961

Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=2050380

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-74/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-77/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-78/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-80/