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TI-2026-10722 Aliases CVE-2026-12490GHSA-27xx-c7vg-hjjj

Bypass of client certificate verification with transfer over TLS

Priority LOW 35CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-07
Fix Fixed NSD (NLnet Labs): 4.14.3

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 LabsNSD4.10.1 to before 4.14.34.14.3Patch availableCNA
  • NSD VendorNLnet Labs Affected 4.10.1 to before 4.14.3 Fixed in 4.14.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*before 4.14.3VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:* Versions before 4.14.3 Vulnerable ·NLNETLABS

Remediation

  • Fix · CNA NSD (NLnet Labs) Fixed in 4.14.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    NLnet Labs NSD 4.14.3

    4 records Highest priority Priority MEDIUM 2 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-10532 Denial of DNS over TLS service by any DoT clientPriority MEDIUM 44
    • TI-2026-10531 Heap overflow and crash with crafted SVCB RRPriority MEDIUM 40
    • TI-2026-10533 Out of bounds stack write with crafted APL RRPriority LOW 32
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-12490
  2. 2026-10-03 Alias added: GHSA-27xx-c7vg-hjjj

References

Patch 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