CVE-2026-118374: falha de alta gravidade em OpenBSD LibreSSL
LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response
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21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
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
Produtos afetados
OpenBSD · LibreSSLCVEs relacionadas — OpenBSD LibreSSL
No mesmo produto, das mais perigosas para as 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%
Referências
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