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Vulnerability record · CVE-2026-10846 · published 10 June 2026

CVE-2026-10846: Nlnetlabs ldns origin validation error vulnerability

Nlnetlabs · Ldns

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.

8.2 CVSS 4.0 High EPSS 0.15% · top 96.7% CWE-346 · Origin validation error
8.2CVSS 4.0 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
23 Jul 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txt Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/06/10/2 Mailing ListPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-1000231Nlnetlabs ldns double free vulnerabilityA double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors.EPSS 2.7%9.8CVE-2017-1000232Nlnetlabs ldns double free vulnerabilityA double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors.EPSS 2.3%7.5CVE-2020-19861Nlnetlabs ldns out-of-bounds read vulnerabilityWhen a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the…EPSS 1.5%6.8CVE-2011-3581Nlnetlabs ldns memory buffer overflow vulnerabilityHeap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers to cause a denial of service (c…EPSS 4.1%6.5CVE-2020-19860Nlnetlabs ldns out-of-bounds read vulnerabilityWhen ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can …EPSS 1.3%6.4CVE-2009-1086Nlnetlabs ldns vulnerabilityHeap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory co…EPSS 3.5%2.1CVE-2014-3209Nlnetlabs ldns permissions and access controls vulnerabilityThe ldns-keygen tool in ldns 1.6.x uses the current umask to set the privileges of the private key, which might allow local users to obtain the priva…EPSS 0.38%9.4CVE-2025-34291Langflow CORS misconfiguration leads to token theft and RCELangflow up to and including 1.6.9 ships an overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) and a refresh token …KEVEPSS 93%analysed

Source: NIST National Vulnerability Database (record CVE-2026-10846), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.