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Back to active CVEs
Medium · CVSS 6.9CVE-2026-18916

Remote TCP DoS by throttling the TCP receive windowCVE-2026-18916

Answer in brief

CVE-2026-18916 records a Medium severity (CVSS 6.9) vulnerability in Remote TCP DoS by throttling the TCP receive window. The current sources do not mark it as known exploited. The current feed maps NLnet Labs/NSD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Sep 8, 2026Source checked Oct 10, 2026First seen by HOL Aug 26, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps NLnet Labs/NSD (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
NLnet Labs/NSDgeneric>=3.2.11 <4.15.14.15.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for NLnet Labs/NSD.
  2. 2Review the reported fix. Source-reported solution: This issue is fixed in 4.15.1 and all later versions.

Evidence timeline and material changes

  1. Published upstream

    Aug 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 26, 2026

Sources and claim methodology

  • Source referencenlnetlabs.nl
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-191
Source
CVE List V5
Source checked
Oct 10, 2026
References
1 linked source
Open source record