What’s Vulnerable › Vulnerabilities
CVE-2026-18916: Remote TCP DoS by throttling the TCP receive window
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-26 · updated 2026-09-08
- Weakness: CWE-191
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.
Affected products
- NLnet Labs NSD: from 3.2.11 before 4.15.1 — fixed in 4.15.1
How to fix
Upgrade to a fixed version: NLnet Labs NSD 4.15.1. Check the vendor advisory for mitigations.
References
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