CVE-2026-80225
Possible degradation of service from continuous queries on the same TCP/DoT connection
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | nlnet labs |
| Product | unbound |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
NLnet Labs / Unbound
0 < 1.26.1
References
Credits
Qifan Zhang (Palo Alto Networks)