CVE-2026-118374: fallo de gravedad alta en OpenBSD LibreSSL
LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.2epss 0.2%
LibreSSL ocspcheck through 4.4.0 contains a memory exhaustion vulnerability that allows malicious OCSP responders to exhaust memory by sending unbounded HTTP responses. Attackers controlling the responder or intercepting plain HTTP AIA OCSP traffic can stream endless headers or body data to http_head_read() and http_body_read(), denying certificate status checks.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Productos afectados
OpenBSD · LibreSSLCVEs relacionadas — OpenBSD LibreSSL
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-118372MEDIUMLibreSSL ocspcheck through 4.4.0 CRLF Injection via AIA OCSP URL PathEPSS 0.1%CVE-2026-118371MEDIUMLibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request LineEPSS 0.1%CVE-2026-118373MEDIUMLibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()EPSS 0.1%
Referencias
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txthttps://github.com/libressl/portablehttps://github.com/openbsd/src/blob/f6f428241d469cf434e60b73fc834d0448f068d5/usr.sbin/ocspcheck/http.c#L419https://github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228https://github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-memory-exhaustion-via-unbounded-ocsp-http-response