{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91143", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-14T20:35:39.074Z", "datePublished": "2026-09-14T21:45:43.908Z", "dateUpdated": "2026-09-14T21:45:43.908Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-14T21:45:43.908Z"}, "datePublic": "2026-07-29T00:00:00.000Z", "title": "goproxy through 15.3 Authentication Bypass via CONNECT", "descriptions": [{"lang": "en", "value": "goproxy through 15.3 fails to apply HTTP proxy basic authentication to CONNECT tunnel requests, allowing unauthenticated clients to bypass credential requirements. Attackers can issue CONNECT requests to establish tunnels through the authenticated proxy without providing credentials, enabling arbitrary TCP traffic relay and access to restricted destinations."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Authentication Bypass Using an Alternate Path or Channel", "cweId": "CWE-288", "type": "CWE"}]}], "affected": [{"vendor": "snail007", "product": "goproxy", "defaultStatus": "unaffected", "packageURL": "pkg:golang/github.com/snail007/goproxy", "versions": [{"version": "0", "lessThanOrEqual": "15.3", "status": "affected", "versionType": "custom"}], "repo": "https://github.com/snail007/goproxy"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:goproxy_project:goproxy:*:*:*:*:*:*:*:*", "versionEndIncluding": "15.3"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 7.2, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/geo-chen/oss/blob/main/goproxy.md", "tags": ["third-party-advisory", "exploit"], "name": "Researcher write-up"}, {"url": "https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go", "tags": ["technical-description"], "name": "utils/structs.go at v15.3"}, {"url": "https://github.com/snail007/goproxy/blob/v15.3/services/http.go", "tags": ["technical-description"], "name": "services/http.go at v15.3"}, {"url": "https://github.com/snail007/goproxy", "tags": ["product"]}, {"name": "VulnCheck Advisory: goproxy through 15.3 Authentication Bypass via CONNECT", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect"}], "credits": [{"lang": "en", "value": "George Chen", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:golang/github.com/snail007/goproxy", "product": "goproxy", "repo": "https://github.com/snail007/goproxy", "vendor": "snail007", "versions": [{"lessThanOrEqual": "15.3", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "goproxy through 15.3 fails to apply HTTP proxy basic authentication to CONNECT tunnel requests, allowing unauthenticated clients to bypass credential requirements. Attackers can issue CONNECT requests to establish tunnels through the authenticated proxy without providing credentials, enabling arbitrary TCP traffic relay and access to restricted destinations."}], "id": "CVE-2026-91143", "lastModified": "2026-09-14T22:16:58.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.7, "source": "[email protected]", "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": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-09-14T22:16:58.880", "references": [{"source": "[email protected]", "url": "https://github.com/geo-chen/oss/blob/main/goproxy.md"}, {"source": "[email protected]", "url": "https://github.com/snail007/goproxy"}, {"source": "[email protected]", "url": "https://github.com/snail007/goproxy/blob/v15.3/services/http.go"}, {"source": "[email protected]", "url": "https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-288"}], "source": "[email protected]", "type": "Primary"}]}

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