CVE-2026-80225CWE-770denial-of-service

CVE-2026-80225

Medium · published September 16, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
40.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00482 · 40.6th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-09-16T13:17Z
Affected products (1)
ProductVersionsFixed in
nlnetlabs/unbound< 1.26.11.26.1
References (1)
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txt · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 16 SEP 08:30Z
    Possible degradation of service from continuous queries on the same TCP/DoT connection
    cvelistv5