{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18916","assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","state":"PUBLISHED","assignerShortName":"NLnet Labs","dateReserved":"2026-08-05T07:36:55.457Z","datePublished":"2026-08-26T08:39:12.258Z","dateUpdated":"2026-08-26T14:22:31.309Z"},"containers":{"cna":{"title":"Remote TCP DoS by throttling the TCP receive window","references":[{"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt","tags":["vendor-advisory"]}],"solutions":[{"lang":"en","value":"This issue is fixed in 4.15.1 and all later versions."}],"affected":[{"vendor":"NLnet Labs","product":"NSD","defaultStatus":"unaffected","versions":[{"version":"3.2.11","status":"affected","lessThan":"4.15.1","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"Akhil Koul (https://github.com/akoul)"}],"timeline":[{"time":"2026-08-01T00:02:43.000Z","lang":"en","value":"Issue reported by Akhil Koul"},{"time":"2026-08-05T07:39:41.000Z","lang":"en","value":"NLnet Labs shares patch"},{"time":"2026-08-05T14:18:42.000Z","lang":"en","value":"Akhil Koul verifies patch"},{"time":"2026-08-26T12:00:00.000Z","lang":"en","value":"Fix released with version 4.15.1"}],"datePublic":"2026-08-26T12:00:00.000Z","descriptions":[{"lang":"en","value":"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."}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"Remote client denying TCP availability by throttling the TCP receive window (down to 1 byte)"}],"cvssV4_0":{"version":"4.0","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-191","description":"CWE-191: Integer Underflow","type":"CWE"}]}],"providerMetadata":{"orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","shortName":"NLnet Labs","dateUpdated":"2026-08-26T08:39:12.258Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-26T14:17:49.150057Z","id":"CVE-2026-18916","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-26T14:22:31.309Z"}}]}}