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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| NLnet Labs | Unbound | < 1.26.1 |
References
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txtPatch, Vendor Advisory
Timeline
- Published
- Sep 16, 2026
- Last modified
- Sep 23, 2026
- NVD status
- Analyzed