CVE-2026-80225
highIn 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…
Vendor / product: Nlnetlabs — unbound
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-16 09:17
Modified: 2026-09-23 19:57
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
nlnetlabs / unbound <1.26.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txt
Patch / mitigation: https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txt
References
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txt sep@nlnetlabs.nl
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗