CVE-2026-18916 (GCVE-0-2026-18916)
Vulnerability from cvelistv5 – Published: 2026-08-26 08:39 – Updated: 2026-08-26 14:22
VLAI
EPSS
VEX
Title
Remote TCP DoS by throttling the TCP receive window
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 14:17 UTC
CWE
- CWE-191 - Integer Underflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-1… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| NLnet Labs | NSD |
Affected:
3.2.11 , < 4.15.1
(semver)
|
guessed |
Date Public
2026-08-26 12:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-18916",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-26T14:17:49.150057Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T14:22:31.309Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "NSD",
"vendor": "NLnet Labs",
"versions": [
{
"lessThan": "4.15.1",
"status": "affected",
"version": "3.2.11",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Akhil Koul (https://github.com/akoul)"
}
],
"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": [
{
"cvssV4_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",
"version": "4.0"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "Remote client denying TCP availability by throttling the TCP receive window (down to 1 byte)"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-191",
"description": "CWE-191: Integer Underflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T08:39:12.258Z",
"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
"shortName": "NLnet Labs"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt"
}
],
"solutions": [
{
"lang": "en",
"value": "This issue is fixed in 4.15.1 and all later versions."
}
],
"timeline": [
{
"lang": "en",
"time": "2026-08-01T00:02:43.000Z",
"value": "Issue reported by Akhil Koul"
},
{
"lang": "en",
"time": "2026-08-05T07:39:41.000Z",
"value": "NLnet Labs shares patch"
},
{
"lang": "en",
"time": "2026-08-05T14:18:42.000Z",
"value": "Akhil Koul verifies patch"
},
{
"lang": "en",
"time": "2026-08-26T12:00:00.000Z",
"value": "Fix released with version 4.15.1"
}
],
"title": "Remote TCP DoS by throttling the TCP receive window",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
"assignerShortName": "NLnet Labs",
"cveId": "CVE-2026-18916",
"datePublished": "2026-08-26T08:39:12.258Z",
"dateReserved": "2026-08-05T07:36:55.457Z",
"dateUpdated": "2026-08-26T14:22:31.309Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-18916",
"date": "2026-09-20",
"epss": "0.00357",
"percentile": "0.29521"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "NSD",
"vendor": "NLnet Labs",
"versions": [
{
"lessThan": "4.15.1",
"status": "affected",
"version": "3.2.11",
"versionType": "semver"
}
]
}
],
"source": "sep@nlnetlabs.nl"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7F075AA7-6056-4671-A4C8-9B373C94506A",
"versionEndExcluding": "4.15.1",
"versionStartIncluding": "3.2.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-18916",
"lastModified": "2026-09-08T20:00:51.850",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "sep@nlnetlabs.nl",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-18916",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-26T14:17:49.150057Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-26T09:16:45.597",
"references": [
{
"source": "sep@nlnetlabs.nl",
"tags": [
"Vendor Advisory"
],
"url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt"
}
],
"sourceIdentifier": "sep@nlnetlabs.nl",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-191"
}
],
"source": "sep@nlnetlabs.nl",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-08-26T12:02:30+00:00",
"cve": "CVE-2026-18916",
"id": "CVE-2026-18916",
"initial_release_date": "2026-08-26T08:39:12.258000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "nsd: NSD: Denial of Service due to TCP receive window throttling",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18916.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-18916",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-26T14:17:49.150057Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T14:22:27.071Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "NSD",
"vendor": "NLnet Labs",
"versions": [
{
"lessThan": "4.15.1",
"status": "affected",
"version": "3.2.11",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Akhil Koul (https://github.com/akoul)"
}
],
"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": [
{
"cvssV4_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",
"version": "4.0"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "Remote client denying TCP availability by throttling the TCP receive window (down to 1 byte)"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-191",
"description": "CWE-191: Integer Underflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-26T08:39:12.258Z",
"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
"shortName": "NLnet Labs"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt"
}
],
"solutions": [
{
"lang": "en",
"value": "This issue is fixed in 4.15.1 and all later versions."
}
],
"timeline": [
{
"lang": "en",
"time": "2026-08-01T00:02:43.000Z",
"value": "Issue reported by Akhil Koul"
},
{
"lang": "en",
"time": "2026-08-05T07:39:41.000Z",
"value": "NLnet Labs shares patch"
},
{
"lang": "en",
"time": "2026-08-05T14:18:42.000Z",
"value": "Akhil Koul verifies patch"
},
{
"lang": "en",
"time": "2026-08-26T12:00:00.000Z",
"value": "Fix released with version 4.15.1"
}
],
"title": "Remote TCP DoS by throttling the TCP receive window",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
"assignerShortName": "NLnet Labs",
"cveId": "CVE-2026-18916",
"datePublished": "2026-08-26T08:39:12.258Z",
"dateReserved": "2026-08-05T07:36:55.457Z",
"dateUpdated": "2026-08-26T14:22:31.309Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…