CVE-2026-18916 | BDVDB-2026-364960 Detail

NLnet LabsNSD

Description#

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact low. Attack vector: network.

Weaknesses#

CWE-191 Integer Underflow

References#

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt

Exploit#

No public exploit known

History#

Version 12026-08-26Record published in the CVE List.

Published

Published: 2026-08-26
Last modified: 2026-08-26

Vendor information

Vendor: NLnet Labs
Product: NSD

All NLnet Labs vulnerabilities

Score

6.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 40.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.2.11 and < 4.15.1
Fixed
4.15.1

Scoring System

CVSS v4.0

6.9 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Metric breakdown
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 v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).