Vulnerability DatabaseCVE-2026-18916
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CVE-2026-18916
Published:August 26, 2026
Updated:September 24, 2026
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.
Affected Packages
https://github.com/NLnetLabs/nsd.git (GITHUB):
Affected version(s) >=NSD_3_2_11_REL <NSD_4_15_1_REL
Fix Suggestion:
Update to version NSD_4_15_1_REL
Related Resources (2)
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt
https://nvd.nist.gov/vuln/detail/CVE-2026-18916
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Integer Underflow (Wrap or Wraparound)
CWE-191
EPSS
Base Score:
0.36