CVE-2026-10846
Publication date 9 June 2026
Last updated 18 June 2026
Ubuntu priority
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.
Read the notes from the security team
Why is this CVE high priority?
CVSSv4.0 high
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| ldns | 26.04 LTS resolute |
Fixed 1.8.4-2ubuntu0.26.04.1~esm1
|
| 25.10 questing |
Vulnerable
|
|
| 24.04 LTS noble |
Fixed 1.8.3-2ubuntu0.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 1.7.1-2ubuntu4+esm2
|
|
| 20.04 LTS focal |
Fixed 1.7.0-4.1ubuntu1+esm2
|
|
| 18.04 LTS bionic |
Fixed 1.7.0-3ubuntu4.1+esm1
|
|
| 16.04 LTS xenial |
Fixed 1.6.17-8ubuntu0.1+esm2
|
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Severity score breakdown
CVSS version: CVSS v4.0
Base score
8.2 · High
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
References
Related Ubuntu Security Notices (USN)
- USN-8449-1
- ldns vulnerability
- 18 June 2026