Read the docs
TI-2026-09311 Aliases CVE-2026-10846GHSA-x77r-8q36-8529

Insufficient verification that responses belong to a query

Priority LOW 35CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 12 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-346.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00147 3rd percentileScored 2026-11-07
Fix Partial ldns (NLnet Labs): 1.9.1Red Hat: 7 advisoriesRed Hat: 12 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NLnet Labsldns1.2.0 to before 1.9.11.9.1Patch availableCNA
  • ldns VendorNLnet Labs Affected 1.2.0 to before 1.9.1 Fixed in 1.9.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:ldns:*:*:*:*:*:*:*:*1.2.0 to before 1.9.1VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:ldns:*:*:*:*:*:*:*:* Versions 1.2.0 to before 1.9.1 Vulnerable ·NLNETLABS

Remediation

  • Fix · CNA ldns (NLnet Labs) Fixed in 1.9.1

Red Hat 7 advisories

  • RHSA-2026:54377 Released 2026-08-12 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) ldns-1.7.1-11.el9_2.1
  • RHSA-2026:54254 Released 2026-08-12 · Red Hat rating Important
    ldns security update
    • 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
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) ldns-1.7.1-12.el9_6.1
  • RHSA-2026:54244 Released 2026-08-12 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) ldns-1.7.1-11.el9_4.1
Show 4 more Red Hat advisories
  • RHSA-2026:53402 Released 2026-08-11 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) ldns-1.8.3-18.el10_0.1
    • 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
  • RHSA-2026:50108 Released 2026-08-04 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream (v. 9) ldns-1.7.1-12.el9_8.1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) ldns-devel-1.7.1-12.el9_8.1, ldns-doc-1.7.1-12.el9_8.1, ldns-utils-1.7.1-12.el9_8.1 +2
  • RHSA-2026:49836 Released 2026-08-04 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream (v. 10) ldns-1.8.3-18.el10_2.1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) ldns-devel-1.8.3-18.el10_2.1, ldns-doc-1.8.3-18.el10_2.1, ldns-utils-1.8.3-18.el10_2.1 +2
  • RHSA-2026:49520 Released 2026-08-03 · Red Hat rating Important
    ldns security update
    • Red Hat Enterprise Linux AppStream (v. 8) ldns-1.7.0-23.el8_10
    • Red Hat Enterprise Linux CRB (v. 8) ldns-devel-1.7.0-23.el8_10, ldns-doc-1.7.0-23.el8_10, ldns-utils-1.7.0-23.el8_10 +2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:54254
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:49836
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:49520
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:50108
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:54377
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:54244
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:53402
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:54254
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:49520
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:49836
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:50108
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:53402
Not affected: 10 products
  • ExternalDNS Operator
  • Red Hat CodeReady Linux Builder EUS (v.9.6)
  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5
  • Red Hat OpenShift Dev Spaces

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-10846
  2. 2026-10-03 Alias added: GHSA-x77r-8q36-8529
  3. 2026-11-05 Affected versions changed · Red Hat

References

Patch 1

Advisory 1

  • TI-2026-25690 Possible arbitrary code execution during DNSSEC validation CVSS 4.0CRITICAL 9.1
  • TI-2026-56302 Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY CVSS 4.0CRITICAL 9.1
  • TI-2026-31146 Crash during DNSSEC validation of malicious content CVSS 4.0HIGH 8.7
  • TI-2026-31135 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options CVSS 4.0HIGH 8.7
  • TI-2026-36436 Routinator crashes on specifically crafted RRDP XML files CVSS 4.0HIGH 8.7
  • TI-2026-36433 Routinator exits when accepting an incoming HTTP or RTR connection fails CVSS 4.0HIGH 8.7
See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences