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TI-2026-10531 Aliases CVE-2026-12244GHSA-p22w-wq6p-g85g

Heap overflow and crash with crafted SVCB RR

Priority MEDIUM 40CWE-122Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00487 42nd 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
Total

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 LabsNSD4.14.0 to before 4.14.34.14.3Patch availableCNA
  • NSD VendorNLnet Labs Affected 4.14.0 to before 4.14.3 Fixed in 4.14.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*4.14.0 to before 4.14.3VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:* Versions 4.14.0 to 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-2026-10722 Bypass of client certificate verification with transfer over TLSPriority LOW 35
    • 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-2026-12244
  2. 2026-10-03 Alias added: GHSA-p22w-wq6p-g85g

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