Description
In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of distinct uncached names over the TCP/DoT connection, monopolizes a single worker's entire event loop for as long as its writes stay ahead of the drain.
Published: 2026-09-16
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

This issue is fixed starting with version 1.26.1

Tracking

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History

Wed, 16 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1050
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 16 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
Description In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of distinct uncached names over the TCP/DoT connection, monopolizes a single worker's entire event loop for as long as its writes stay ahead of the drain.
Title Possible degradation of service from continuous queries on the same TCP/DoT connection
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: NLnet Labs

Published:

Updated: 2026-09-16T14:33:08.344Z

Reserved: 2026-09-07T14:06:21.952Z

Link: CVE-2026-80225

cve-icon Vulnrichment

Updated: 2026-09-16T14:33:01.748Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-16T09:17:06.100

Modified: 2026-09-16T19:41:10.423

Link: CVE-2026-80225

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-16T08:30:04Z

Links: CVE-2026-80225 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T14:15:09Z

Weaknesses