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CVE-2026-18916

Remote TCP DoS by throttling the TCP receive window

HIGH
7.5
CVSS Score
Published: August 26, 2026 at 08:39 AM UTC
Updated: September 8, 2026 at 08:19 PM UTC
1 product affected across 1 vendorNsd

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nsd· Nlnetlabs
95%
3.2.11 ≤ v < 4.15.13.2.11
Affected range stops below 4.15.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-191

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