CVE-2026-10846 HIGH

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

Vendor Nlnet Labs
Product ldns
Weakness CWE-346 · Origin validation
Published June 10, 2026
Last update June 10, 2026
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 10, 2026 Record updated

Related vulnerabilities

04Related CVE

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