CVE-2026-47066

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El analizador de encabezados de respuesta Alt-Svc en src/hackney_altsvc.erl no garantiza el progreso hacia adelante. Cuando parse_token/2 recibe un byte que no es un token, no es un espacio en blanco, no es una coma (p. ej. '!', '@', '=', ';'), devuelve la entrada sin cambios. skip_comma/1 tambi\u00e9n devuelve el b\u00fafer sin cambios cuando el primer byte no es una coma. parse_entries/2 luego recurre con datos id\u00e9nticos, creando un bucle recursivo de cola infinito y ajustado que fija un planificador al 100% de CPU. El proceso de llamada nunca regresa.\n\nEl punto de entrada parse_and_cache/3 se llama sincr\u00f3nicamente en el proceso de conexi\u00f3n en cada respuesta HTTP. Un encabezado de respuesta Alt-Svc: '!' de un solo byte es suficiente para activar el bloqueo; el encabezado est\u00e1 totalmente controlado por cualquier origen HTTP al que se conecta el cliente.\n\nEste problema afecta a hackney: desde 2.0.0-beta.1 antes de 4.0.1."}], "id": "CVE-2026-47066", "lastModified": "2026-07-24T10:10:00.197", "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": 8.7, "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:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47066", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-26T15:50:47.725364Z", "version": "2.0.3"}}]}, "published": "2026-05-25T15:16:21.597", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch", "Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-47066.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch", "Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47066"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-beta.1,4.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[408e5fe20302226ea8c74dde2bcbd452d712b5b2,e548aba1f97ffa3f4750da7b772998fb78c01894)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "hackney", "vendor": "benoitc"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-beta.1,4.0.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "hackney", "source": "cna", "vendor": "benoitc"}, "product": "hackney", "vendor": "benoitc"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[408e5fe20302226ea8c74dde2bcbd452d712b5b2,e548aba1f97ffa3f4750da7b772998fb78c01894)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "hackney", "source": "cna", "vendor": "benoitc"}, "product": "hackney", "vendor": "benoitc"}], "created": "2026-05-25T16:00:14.105518+00:00", "updated": "2026-05-25T22:00:12.162939+00:00", "vendors": ["benoitc", "benoitc$PRODUCT$hackney"]}