CVE-2026-10846 Insufficient verification that responses belong to a query
Attackers can poison DNS responses in applications using ldns over UDP due to insufficient verification of response origin and content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10846?
CVE-2026-10846 is a high-severity vulnerability in NLnet Labs ldns, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-10846?
It affects 1 product.
Linux distribution packages (40)
ldns AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
ldns-devel AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
ldns-doc AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
ldns-utils AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
perl-ldns AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
python3-ldns AlmaLinux:10 | All versions | 1.8.3-18.el10_2.1 |
ldns AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
ldns-devel AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
ldns-doc AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
ldns-utils AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
perl-ldns AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
python3-ldns AlmaLinux:8 | All versions | 1.7.0-23.el8_10 |
ldns AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
ldns-devel AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
ldns-doc AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
ldns-utils AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
perl-ldns AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
python3-ldns AlmaLinux:9 | All versions | 1.7.1-12.el9_8.1 |
ldns Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-debugsource Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-devel Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-doc Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-utils Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns-utils-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
perl-ldns Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
perl-ldns-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
python3-ldns Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
python3-ldns-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.8.3-18.el10_2.1 |
ldns Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
ldns-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
ldns-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
ldns-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
perl-ldns-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
python3-ldns-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.7.0-23.el8_10 |
ldns-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-23.el8_10 |
ldns-debugsource Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-23.el8_10 |
ldns-devel Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-23.el8_10 |
ldns-doc Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-23.el8_10 |
ldns-utils Red Hat:enterprise_linux:8::crb | All versions | 0:1.7.0-23.el8_10 |
Products include Nlnetlabs Ldns.
How do I fix CVE-2026-10846?
Upgrade to a fixed version.
Is CVE-2026-10846 being exploited?
There is no known exploitation of CVE-2026-10846 in the wild and no public exploit code.
Other vulnerabilities in NLnet Labs ldns
Sources
Also known as ALSA-2026:49520, ALSA-2026:49836, ALSA-2026:50108, AZL-89715, CLSA-2026-1784215324, CLSA-2026-1784986614 and 20 more.