{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-19538", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "state": "PUBLISHED", "assignerShortName": "NLnet Labs", "dateReserved": "2026-08-11T10:27:22.294Z", "datePublished": "2026-08-26T08:47:08.992Z", "dateUpdated": "2026-08-26T14:00:12.918Z"}, "containers": {"cna": {"title": "Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS", "references": [{"url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.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": "4.8.0", "status": "affected", "lessThan": "4.15.1", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Qifan Zhang from Palo Alto Networks"}], "timeline": [{"time": "2026-07-15T18:04:25.000Z", "lang": "en", "value": "Issue reported by Qifan Zhang"}, {"time": "2026-08-10T07:56:32.000Z", "lang": "en", "value": "NLnet Labs shares patch"}, {"time": "2026-08-15T00:00:00.000Z", "lang": "en", "value": "Qifan Zhang 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": "The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open."}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "Explicitly denied access to the proxy protocol port is bypassed on TCP or TLS"}], "cvssV4_0": {"version": "4.0", "baseScore": 8.2, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing", "type": "CWE"}, {"lang": "en", "cweId": "CWE-672", "description": "CWE-672 Operation on a Resource after Expiration or Release", "type": "CWE"}]}], "providerMetadata": {"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "shortName": "NLnet Labs", "dateUpdated": "2026-08-26T08:47:08.992Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-26T13:51:21.490331Z", "id": "CVE-2026-19538", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-08-26T14:00:12.918Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-19538", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-26T13:51:21.490331Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T14:00:08.820Z"}}], "cna": {"title": "Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS", "credits": [{"lang": "en", "type": "finder", "value": "Qifan Zhang from Palo Alto Networks"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "baseScore": 8.2, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}, "scenarios": [{"lang": "en", "value": "Explicitly denied access to the proxy protocol port is bypassed on TCP or TLS"}]}], "affected": [{"vendor": "NLnet Labs", "product": "NSD", "versions": [{"status": "affected", "version": "4.8.0", "lessThan": "4.15.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-07-15T18:04:25.000Z", "value": "Issue reported by Qifan Zhang"}, {"lang": "en", "time": "2026-08-10T07:56:32.000Z", "value": "NLnet Labs shares patch"}, {"lang": "en", "time": "2026-08-15T00:00:00.000Z", "value": "Qifan Zhang verifies patch"}, {"lang": "en", "time": "2026-08-26T12:00:00.000Z", "value": "Fix released with version 4.15.1"}], "solutions": [{"lang": "en", "value": "This issue is fixed in 4.15.1 and all later versions."}], "datePublic": "2026-08-26T12:00:00.000Z", "references": [{"url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing"}, {"lang": "en", "type": "CWE", "cweId": "CWE-672", "description": "CWE-672 Operation on a Resource after Expiration or Release"}]}], "providerMetadata": {"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "shortName": "NLnet Labs", "dateUpdated": "2026-08-26T08:47:08.992Z"}}}, "cveMetadata": {"cveId": "CVE-2026-19538", "state": "PUBLISHED", "dateUpdated": "2026-08-26T14:00:12.918Z", "dateReserved": "2026-08-11T10:27:22.294Z", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "datePublished": "2026-08-26T08:47:08.992Z", "assignerShortName": "NLnet Labs"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "NSD", "vendor": "NLnet Labs", "versions": [{"lessThan": "4.15.1", "status": "affected", "version": "4.8.0", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open."}], "id": "CVE-2026-19538", "lastModified": "2026-09-01T21:03:04.987", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "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:P/PR:N/UI:N/VC:H/VI:N/VA:N/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": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-19538", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T13:51:21.490331Z", "version": "2.0.3"}}]}, "published": "2026-08-26T09:16:46.057", "references": [{"source": "[email protected]", "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-672"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.8.0,4.15.1)"}}], "enrichment": {"confidence": 96.0, "confidence_source": "matching", "scores": [{"score": 96.0, "source": "matching"}]}, "original": {"product": "NSD", "source": "cna", "vendor": "NLnet Labs"}, "product": "nsd", "vendor": "nlnetlabs"}], "created": "2026-08-26T10:30:04.370923+00:00", "updated": "2026-09-01T14:24:23.533067+00:00", "vendors": ["nlnetlabs", "nlnetlabs$PRODUCT$nsd"]}