CVE-2026-118374
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Oct 28, 2026
Vendor
unknown
Description
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.
References
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt
- https://github.com/libressl/portable
- https://github.com/openbsd/src/blob/f6f428241d469cf434e60b73fc834d0448f068d5/usr.sbin/ocspcheck/http.c#L419
- https://github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228
- https://github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59