{"id":"CVE-2026-118373","title":"LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()","summary":"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 htt…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-319"],"vendor":"OpenBSD","product":"LibreSSL","affected":["LibreSSL <= 4.4.0"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T02:03:21.525Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118373","references":[{"url":"https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25"},{"url":"https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299"},{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","label":"LibreSSL 4.4.0 Release Notes"},{"url":"https://github.com/libressl/portable"},{"url":"https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host","label":"VulnCheck Advisory: LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T03:02:57.623Z","slug":"CVE-2026-118373","body":"## Overview\n\nLibreSSL 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.\n\n## Affected\n\n- `LibreSSL <= 4.4.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}