What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-10 · updated 2026-07-23
• Weakness: CWE-346

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.

Affected products

• NLnet Labs ldns: from 1.2.0 before 1.9.1 — fixed in 1.9.1

How to fix

Upgrade to a fixed version: NLnet Labs ldns 1.9.1. Check the vendor advisory for mitigations.

References

• https://www.nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txt
• http://www.openwall.com/lists/oss-security/2026/06/10/2

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