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Fencer Vulns
high 7.5

CVE-2026-10846 json

Insufficient verification that responses belong to a query

published 2026-06-10 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-35991

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

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.

Patch / fix

  • NLnet Labs ldns 1.9.1
  • ldns Debian 14 1.9.2-1

debian advisories DEBIAN-CVE-2026-10846

  • ldns Ubuntu Pro 16.04 LTS 1.6.17-8ubuntu0.1+esm2
  • ldns Ubuntu Pro 18.04 LTS 1.7.0-3ubuntu4.1+esm1
  • ldns Ubuntu Pro 20.04 LTS 1.7.0-4.1ubuntu1+esm2
  • ldns Ubuntu Pro 22.04 LTS 1.7.1-2ubuntu4+esm2
  • ldns Ubuntu Pro 24.04 LTS 1.8.3-2ubuntu0.1~esm1
  • ldns Ubuntu Pro 26.04 LTS 1.8.4-2ubuntu0.26.04.1~esm1

ubuntu advisories UBUNTU-CVE-2026-10846

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ldns RHEL 9 1.7.1-12.el9_8.1
  • perl-ldns RHEL 9 1.7.1-12.el9_8.1
  • ldns-utils RHEL 9 1.7.1-12.el9_8.1
  • python3-ldns RHEL 9 1.7.1-12.el9_8.1
  • ldns RHEL 10.2 1.8.3-18.el10_2.1
  • perl-ldns RHEL 10.2 1.8.3-18.el10_2.1
  • ldns-utils RHEL 10.2 1.8.3-18.el10_2.1
  • python3-ldns RHEL 10.2 1.8.3-18.el10_2.1

red hat advisories RHSA-2026:54377RHSA-2026:54254RHSA-2026:54244RHSA-2026:53402RHSA-2026:50108RHSA-2026:49836

  • ldns SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Package Hub 15 SP7 +2 more 1.8.3-150600.3.3.1
  • ldns SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.7.0-150000.4.11.1
  • ldns SLES for SAP applications 16.0, SLES 16.0 1.8.4-160000.3.1

suse advisories SUSE-SU-2026:2462-1SUSE-SU-2026:2461-1SUSE-SU-2026:22167-1

  • ldns openSUSE Leap 16.0 1.8.4-160000.3.1
  • ldns openSUSE Tumbleweed 1.9.2-1.1

opensuse advisories openSUSE-SU-2026:21093-1openSUSE-SU-2026:10998-1

  • ldns AlmaLinux 9 1.7.1-12.el9_8.1
  • perl-ldns AlmaLinux 9 1.7.1-12.el9_8.1
  • ldns-utils AlmaLinux 9 1.7.1-12.el9_8.1
  • python3-ldns AlmaLinux 9 1.7.1-12.el9_8.1
  • ldns AlmaLinux 8 1.7.0-23.el8_10
  • perl-ldns AlmaLinux 8 1.7.0-23.el8_10
  • ldns-utils AlmaLinux 8 1.7.0-23.el8_10
  • python3-ldns AlmaLinux 8 1.7.0-23.el8_10

almalinux advisories ALSA-2026:50108ALSA-2026:49520ALSA-2026:49836

  • ldns Rocky Linux 10 1.8.3-18.el10_2.1
  • ldns Rocky Linux 9 1.7.1-12.el9_8.1
  • ldns Rocky Linux 8 1.7.0-23.el8_10

rocky linux advisories RLSA-2026:49836RLSA-2026:50108RLSA-2026:49520

  • ldns Azure Linux 3.0 1.8.3-3

azure linux advisories AZL-89715

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-10846 updated cvss 7.5

ldns: ldns: Off-path poisoning attacks due to insufficient query-response matching

  • Red Hat Enterprise Linux 6 ldns, ldns-python
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 ldns, ldns-python
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) perl-ldns 1.7.1-12.el9_6.1, python3-ldns 1.7.1-12.el9_6.1
    fixed: vendor fix RHSA-2026:54254
  • Red Hat Enterprise Linux AppStream (v. 8) ldns 1.7.0-23.el8_10
    fixed: vendor fix RHSA-2026:49520
  • Red Hat Enterprise Linux AppStream (v. 9) ldns 1.7.1-12.el9_8.1
    fixed: vendor fix RHSA-2026:50108
  • Red Hat Enterprise Linux AppStream (v. 10) ldns 1.8.3-18.el10_2.1
    fixed: vendor fix RHSA-2026:49836
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) ldns 1.7.1-11.el9_2.1
    fixed: vendor fix RHSA-2026:54377
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) ldns 1.7.1-11.el9_4.1
    fixed: vendor fix RHSA-2026:54244
show 9 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) ldns 1.8.3-18.el10_0.1
    fixed: vendor fix RHSA-2026:53402
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) ldns 1.7.1-12.el9_6.1
    fixed: vendor fix RHSA-2026:54254
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) perl-ldns 1.7.1-12.el9_8.1, ldns-utils 1.7.1-12.el9_8.1, python3-ldns 1.7.1-12.el9_8.1
    fixed: vendor fix RHSA-2026:50108
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) perl-ldns 1.8.3-18.el10_2.1, ldns-utils 1.8.3-18.el10_2.1, python3-ldns 1.8.3-18.el10_2.1
    fixed: vendor fix RHSA-2026:49836
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) perl-ldns 1.8.3-18.el10_0.1, python3-ldns 1.8.3-18.el10_0.1
    fixed: vendor fix RHSA-2026:53402
  • Red Hat Enterprise Linux CRB (v. 8) perl-ldns 1.7.0-23.el8_10, ldns-utils 1.7.0-23.el8_10, python3-ldns 1.7.0-23.el8_10
    fixed: vendor fix RHSA-2026:49520
  • Red Hat ExternalDNS Operator edo/external-dns-rhel8, edo/external-dns-rhel9 Red Hat CodeReady Linux Builder EUS (v.9.6) ldns-utils 1.7.1-12.el9_6.1 Red Hat Enterprise Linux AppStream E4S (v.9.2) ldns-debuginfo 1.7.1-11.el9_2.1, ldns-debugsource 1.7.1-11.el9_2.1, perl-ldns-debuginfo 1.7.1-11.el9_2.1, ldns-utils-debuginfo 1.7.1-11.el9_2.1, python3-ldns-debuginfo 1.7.1-11.el9_2.1 Red Hat Enterprise Linux AppStream E4S (v.9.4) ldns-debuginfo 1.7.1-11.el9_4.1, ldns-debugsource 1.7.1-11.el9_4.1, perl-ldns-debuginfo 1.7.1-11.el9_4.1, ldns-utils-debuginfo 1.7.1-11.el9_4.1, python3-ldns-debuginfo 1.7.1-11.el9_4.1 Red Hat Enterprise Linux AppStream EUS (v. 10.0) ldns-debuginfo 1.8.3-18.el10_0.1, ldns-debugsource 1.8.3-18.el10_0.1, perl-ldns-debuginfo 1.8.3-18.el10_0.1, ldns-utils-debuginfo 1.8.3-18.el10_0.1, python3-ldns-debuginfo 1.8.3-18.el10_0.1 Red Hat Enterprise Linux AppStream EUS (v.9.6) ldns-debuginfo 1.7.1-12.el9_6.1, ldns-debugsource 1.7.1-12.el9_6.1, perl-ldns-debuginfo 1.7.1-12.el9_6.1, ldns-utils-debuginfo 1.7.1-12.el9_6.1, python3-ldns-debuginfo 1.7.1-12.el9_6.1
    +1 more products
    Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) ldns-utils 1.8.3-18.el10_0.1
    not affected: vulnerable code not present
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift Dev Spaces devspaces/traefik-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CNA 4.0 8.2 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:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • NLnet Labs ldns

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.