CVE-2026-10846

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNlnetlabs Ldns

PublishedJun 10, 2026

First seenJun 10, 2026

Weakness typeCWE-346CWE-346

How to fix

Update

nlnetlabs ldns1.9.1 or later

Vendor advisories

nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txt

Affected products

Product	Affected versions	Fixed in
nlnetlabs ldns	1.2.0 ≤ v < 1.9.1	1.9.1

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