Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nlnetlabs | Ldns | >= 1.2.0, < 1.9.1 |
Related Weaknesses (CWE)
References
- https://www.nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txtVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/06/10/2Mailing ListPatchThird Party Advisory
FAQ
What is CVE-2026-10846?
CVE-2026-10846 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-10846?
CVE-2026-10846 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-10846?
Check the references section above for vendor advisories and patch information. Affected products include: Nlnetlabs Ldns.