CVE-2026-80225: medium-severity vulnerability in NLnet Labs Unbound
Possible degradation of service from continuous queries on the same TCP/DoT connection
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
NLnet Labs · UnboundRelated CVEs — NLnet Labs Unbound
In the same product, most dangerous first.
CVE-2024-1931HIGHDenial of service when trimming EDE text on positive repliesEPSS 2.5%CVE-2022-3204HIGHNRDelegation AttackEPSS 1.6%CVE-2026-33278CRITICALPossible arbitrary code execution during DNSSEC validationEPSS 1.4%CVE-2022-30699—Novel "ghost domain names" attack by updating almost expired delegation informationEPSS 1.2%CVE-2022-30698—Novel "ghost domain names" attack by introducing subdomain delegationsEPSS 1.2%CVE-2026-81642CRITICALHeap buffer overflow and possible Remote Code Execution when digesting DNSKEYEPSS 1.0%