CVE-2026-18916

6.9 mediumEPSS 0.5%

Medium (6.9) in nlnetlabs nsd. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

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

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE: CWE-191
Published: 2026-08-26
Modified: 2026-09-08
Record from: the NVD, synced 2026-10-19

Affected

nlnetlabs:nsd

References

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

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