{"id":"CVE-2026-118373","published":"2026-10-28T03:17:13.770","lastModified":"2026-10-28T03:17:13.770","description":"LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_alloc() only selects TLS for port 443. On-path network attackers can read OCSP requests sent to https responder URLs on non-443 ports, exposing certificate serial numbers, issuer hashes, and nonces.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cwes":["CWE-319"],"vendors":[],"products":[],"references":[{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","tags":[]},{"url":"https://github.com/libressl/portable","tags":[]},{"url":"https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299","tags":[]},{"url":"https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25","tags":[]},{"url":"https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host","tags":[]}],"exploitRefs":[{"url":"https://github.com/libressl/portable","tags":[]},{"url":"https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299","tags":[]},{"url":"https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25","tags":[]}],"hasPoc":true,"ai":null}