{
    "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": "2026-08-26T08:39:12.258Z"
    },
    "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"
            },
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    }
}