dbcve.org
LdnsApplication · Nlnetlabs

CVE-2026-10846

HIGH · 7.5 CVSS v3.1 Published 2026-06-10
Fix available
A fix is available. Upgrade to 1.9.1 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
LdnsApplication
Affected:>= 1.2.0, < 1.9.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.9.1 or later
Fixed in 1.9.1
Vendor patch www.openwall.com →
Recommended fix High confidence

ldns 1.9.1

  1. Verify the current installed version of ldns by running 'ldns-version' or checking your package manager
  2. For source compilation: Download ldns version 1.9.1 or later from the official NLnet Labs repository (github.com/NLnetLabs/ldns)
  3. Extract the source archive and navigate to the directory
  4. Run './configure' to prepare the build, then 'make' to compile
  5. Run 'make install' to install the updated version
  6. For package manager users: Update your system packages using your distribution's package manager (e.g., apt-get update && apt-get install ldns, yum update ldns, or dnf update ldns)
  7. Verify the installed version is 1.9.1 or later using 'ldns-version' or 'drill -v'
  8. Test that any dependent applications (particularly drill) function correctly with the updated library
Caveat Review release notes for 1.9.1 for any API changes that might affect custom applications using ldns as a library

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-10846 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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