CVE-2026-109779

Race condition in the Networking: DNS component

Published Oct 13, 2026 CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Description
Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox
Type Values Removed Values Added
Description Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158. Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
References
Type Values Removed Values Added
Weaknesses CWE-362
Metrics cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158.
Title Race condition in the Networking: DNS component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Oct 13, 2026, 6:08 PM
Reserved
Oct 13, 2026, 12:49 AM
Status
Deferred
Published
Oct 13, 2026, 1:17 PM
Modified
Oct 13, 2026, 7:18 PM