{"id":"CVE-2026-118373","revision":"5a51aa7a37e841d7a8102308cd6a2457","records":[{"revision":"5a51aa7a37e841d7a8102308cd6a2457","observedAt":"2026-10-28T03:51:21.076+00:00","statement":{"source":"cve-program","id":"CVE-2026-118373","aliases":[],"title":"LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()","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.","state":0,"publishedAt":"2026-10-28T02:03:21.525+00:00","modifiedAt":"2026-10-28T02:03:21.525+00:00","affected":[{"ecosystem":"Vendor product","name":"LibreSSL","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"OpenBSD\",\n                    \"product\": \"LibreSSL\",\n                    \"packageURL\": \"pkg:github/libressl/portable\",\n                    \"repo\": \"https://github.com/libressl/portable\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"4.4.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7,"severity":"LOW"}],"references":["https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25","https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299","https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","https://github.com/libressl/portable","https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118373","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-118373","identifiers":["CVE-2026-118373"]},"retained":false,"historicalAffected":[]}],"coverage":[]}