Insufficient verification that responses belong to a query
CVE-2026-10846

8.2HIGH

Key Information:

Vendor

Nlnet Labs

Status
Ldns
Vendor
CVE Published:
10 June 2026

What is CVE-2026-10846?

NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.

Affected Version(s)

ldns 1.2.0 < 1.9.1

References

https://www.nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txt
vendor-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Pablo Ruiz from 'codecome.ai'
.