CVE-2026-63388

{"id": "CVE-2026-63388", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63388", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-21T21:00:24.903079Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.4, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.5}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "libevent", "product": "libevent", "versions": [{"status": "affected", "version": "< 2.1.13"}, {"status": "affected", "version": ">= 2.2.0-alpha, < 2.2.2-alpha"}]}]}], "published": "2026-08-20T18:16:36.893", "references": [{"url": "https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9", "source": "security-advisories@github.com"}, {"url": "https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72", "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-cvq5-vrvr-j338", "source": "security-advisories@github.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-617"}, {"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha."}, {"lang": "es", "value": "Libevent es una biblioteca de notificaci\u00f3n de eventos. Antes de las versiones 2.1.13 y 2.2.2-alpha, libevent tiene una escritura fuera de l\u00edmites en el heap en bufferevent_sock.c cuando bufferevent_socket_set_conn_address_ copia una direcci\u00f3n de par AF_UNIX suministrada por el kernel en bufferevent_private.conn_address. Las compilaciones de lanzamiento compiladas con NDEBUG deshabilitan la protecci\u00f3n de longitud EVUTIL_ASSERT, y la ruta de aceptaci\u00f3n de evhttp puede pasar una sockaddr de 110 bytes de accept() al campo de 28 bytes. Un par local no autenticado capaz de conectarse a un oyente AF_UNIX puede sobrescribir el puntero dns_request adyacente y los datos del heap, causando corrupci\u00f3n de memoria con impacto en la confidencialidad, integridad y disponibilidad. Este problema est\u00e1 corregido en las versiones 2.1.13 y 2.2.2-alpha."}], "lastModified": "2026-10-26T10:10:00.140", "sourceIdentifier": "security-advisories@github.com"}