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TI-2026-15468 Aliases CVE-2026-18916GHSA-m6mr-q7j3-3rc6

Remote TCP DoS by throttling the TCP receive window

Priority LOW 37CWE-191Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0046 40th percentileScored 2026-11-07
Fix Fixed NSD (NLnet Labs): 4.15.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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 LabsNSD3.2.11 to before 4.15.14.15.1Patch availableCNA
  • NSD VendorNLnet Labs Affected 3.2.11 to before 4.15.1 Fixed in 4.15.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*3.2.11 to before 4.15.1VulnerableNLNETLABS
  • cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:* Versions 3.2.11 to before 4.15.1 Vulnerable ·NLNETLABS

Remediation

  • Fix · CNA NSD (NLnet Labs) Fixed in 4.15.1

Fixed in the same release

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

  • Release ·

    NLnet Labs NSD 4.15.1

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-15894 Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLSPriority LOW 36
    • TI-2026-15825 Remote UDP DoS by sending multiple DNS Cookie optionsPriority LOW 36
    • TI-2026-15293 Wrong interpretation of ACL rangesPriority LOW 36
    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-2026-18916
  2. 2026-10-03 Alias added: GHSA-m6mr-q7j3-3rc6

References

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