CVE-2026-109779
Received Received - Intake

Race Condition in Firefox Networking DNS Component

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-13
EPSS Evaluated
2026-10-18
NVD
CVE-2026-109779
EUVD
EUVD-2026-98539

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox 158

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

This is a race condition vulnerability in Firefox's Networking: DNS component. A race condition occurs when the behavior of a system depends on the sequence or timing of uncontrollable events. In this case, it was fixed in Firefox version 158.

Impact Analysis

A race condition in DNS networking could potentially allow attackers to manipulate DNS queries, leading to incorrect IP address resolution. This might result in users being redirected to malicious websites instead of legitimate ones.

Compliance Impact

This vulnerability is a race condition in Firefox's Networking: DNS component, which could lead to unauthorized information disclosure or manipulation. Such issues may impact compliance with GDPR (data protection) or HIPAA (health data security) by potentially exposing sensitive user data during DNS resolution.

Mitigation Strategies

Update Firefox to version 158 or later to address the race condition in the Networking: DNS component.

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