CVE-2026-63385

{"id": "CVE-2026-63385", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63385", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-21T20:58:44.281954Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "libevent", "product": "libevent", "versions": [{"status": "affected", "version": ">= 2.2.0-alpha, < 2.2.2-alpha"}, {"status": "affected", "version": "< 2.1.13"}]}]}], "published": "2026-08-20T18:16:36.543", "references": [{"url": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0", "source": "security-advisories@github.com"}, {"url": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2", "source": "security-advisories@github.com"}, {"url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable", "source": "security-advisories@github.com"}, {"url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha", "source": "security-advisories@github.com"}, {"url": "https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2", "source": "security-advisories@github.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-444"}]}], "descriptions": [{"lang": "en", "value": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition."}, {"lang": "es", "value": "Libevent es una biblioteca de notificaci\u00f3n de eventos. Antes de 2.1.13 y 2.2.2-alpha, libevent tiene dos debilidades de an\u00e1lisis HTTP en http.c. evhttp_decode_uri_internal decodifica bytes %00 codificados por porcentaje en caracteres NUL literales, lo que puede causar que las operaciones de cadena C posteriores trunquen una ruta y omitan la validaci\u00f3n realizada en una representaci\u00f3n diferente. evhttp_header_is_valid_value tambi\u00e9n acepta el plegado de l\u00ednea obsoleto en valores de encabezado que contienen caracteres de retorno de carro o salto de l\u00ednea, lo que permite que un proxy y libevent interpreten los encabezados de manera diferente y habilita la inyecci\u00f3n de encabezados o la omisi\u00f3n del control de acceso. La aceptaci\u00f3n de encabezados CRLF est\u00e1 corregida en las versiones 2.1.13 y 2.2.2-alpha, pero los parches revisados no remedian claramente la condici\u00f3n de truncamiento NUL de URI."}], "lastModified": "2026-10-26T10:10:00.140", "sourceIdentifier": "security-advisories@github.com"}