CVE-2026-74961

Undergoing Analysis Undergoing Analysis - In Progress

Side-channel Vulnerability in Firefox Web Audio Component

Publication date: 2026-08-18

Last updated on: 2026-08-20

Assigner: Mozilla Corporation

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 Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-18

Last Modified

2026-08-20

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-74961

EUVD

EUVD-2026-60685

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.1.0 (exc)
mozilla	thunderbird	to 153.1.0 (exc)
mozilla	firefox	to 153.1.0 (exc)
mozilla	thunderbird	to 153.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-203	The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Attack-Flow Graph

Executive Summary

This is a side-channel vulnerability in the Web Audio component of Firefox. Side-channel attacks exploit indirect information leaks, such as timing or power consumption, to infer sensitive data. The issue was addressed in Firefox 154 and Firefox ESR 153.1.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. Versions before 154 or ESR 153.1 are vulnerable.

Impact Analysis

An attacker could potentially exploit this flaw to gather sensitive information from your system, such as audio processing data or other side-channel leaks. This could lead to privacy breaches or unauthorized data access if combined with other vulnerabilities.

Mitigation Strategies

Update Firefox to version 154 or Firefox ESR to 153.1 or later. Disable Web Audio if updates are not immediately possible.

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