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Medium 6.9Published Aug 26, 2026
CVE-2026-18916Remote TCP DoS by throttling the TCP receive window
Updated under an hour ago ()
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It affects NLnet Labs NSD and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.9 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-191
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NLnet Labs
- NVD analysis
- Analyzed
- Record last updated
- Aug 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
NLnet Labs NSD nlnet_labs:nsd (from the name) | from 3.2.11 before 4.15.1 | CNA record |
nlnetlabs nsd nlnetlabs:nsd | from 3.2.11 before 4.15.1 | NVD |
References
- https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txtvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.