Vulnerability · Published Jun 10, 2026 · Assigned by NLnet Labs
CVE-2026-10846Insufficient verification that responses belong to a query
High 8.2
In plain English
A high-severity security flaw in ldns from NLnet Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | ldns | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | ldns | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | ldns | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| AlmaLinux:10 | ldns-devel | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | ldns-devel | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | ldns-devel | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| AlmaLinux:10 | ldns-doc | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | ldns-doc | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | ldns-doc | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| AlmaLinux:10 | ldns-utils | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | ldns-utils | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | ldns-utils | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| AlmaLinux:10 | perl-ldns | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | perl-ldns | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | perl-ldns | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| AlmaLinux:10 | python3-ldns | 1.8.3-18.el10_2.1 | ALSA-2026:49836 |
| AlmaLinux:8 | python3-ldns | 1.7.0-23.el8_10 | ALSA-2026:49520 |
| AlmaLinux:9 | python3-ldns | 1.7.1-12.el9_8.1 | ALSA-2026:50108 |
| Debian:12 | ldns | no fix listed | DEBIAN-CVE-2026-10846 |
| Debian:13 | ldns | no fix listed | DEBIAN-CVE-2026-10846 |
| Debian:14 | ldns | 1.9.2-1 | DEBIAN-CVE-2026-10846 |
| Rocky Linux:10 | ldns | 0:1.8.3-18.el10_2.1 | RLSA-2026:49836 |
| Rocky Linux:8 | ldns | 0:1.7.0-23.el8_10 | RLSA-2026:49520 |
| Rocky Linux:9 | ldns | 0:1.7.1-12.el9_8.1 | RLSA-2026:50108 |
| Ubuntu:25.10 | ldns | no fix listed | UBUNTU-CVE-2026-10846 |
| Ubuntu:26.10 | ldns | no fix listed | UBUNTU-CVE-2026-10846 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| NLnet Labs | ldns | 1.2.0 – before 1.9.1 |
Weakness: CWE-346 · 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