{"id":"CVE-2026-118373","aliases":["EUVD-2026-111549","GHSA-56qc-c576-qq46"],"status":"published","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.","severity":{"version":"4.0","score":6.3,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0009,"percentile":0.0043,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-319"],"published":"2026-10-28T02:03:21Z","modified":"2026-11-05T15:43:31Z","products":[{"vendor":"libressl","product":"libressl"},{"vendor":"openbsd","product":"libressl"}],"references":[{"url":"https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25","tags":["patch","fix"]},{"url":"https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299","tags":["technical-description","article"]},{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","tags":["release-notes","advisory"]},{"url":"https://github.com/libressl/portable","tags":["product","package"]},{"url":"https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118373","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-56qc-c576-qq46"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118373.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-118373","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.","status":"published","published":"2026-10-28T02:03:21.525Z","modified":"2026-11-05T15:43:31.762Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium","assessor":"cna"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-319"],"updated_at":"2026-11-05T16:36:34.343037Z"}],"euvd":[{"id":"EUVD-2026-111549","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.","status":"published","published":"2026-10-28T02:03:21Z","modified":"2026-11-05T15:43:31Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"updated_at":"2026-11-05T18:00:59.460287Z"}],"ghsa":[{"id":"GHSA-56qc-c576-qq46","title":"LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because 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.","status":"published","published":"2026-10-28T03:31:51Z","modified":"2026-10-28T03:31:58Z","cvss":[{"version":"4.0","score":6.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-319"],"updated_at":"2026-11-02T15:14:32.579072Z"}],"nvd":[{"id":"CVE-2026-118373","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.","status":"published","published":"2026-10-28T03:17:13.77Z","modified":"2026-11-05T16:17:40.063Z","cvss":[{"version":"4.0","score":6.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-319"],"updated_at":"2026-11-05T19:56:08.367069Z"}],"osv":[{"id":"CVE-2026-118373","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.","status":"published","published":"2026-10-28T02:03:21.525Z","modified":"2026-11-09T13:02:47.568559237Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"cwes":["CWE-319"],"updated_at":"2026-11-07T03:08:01.41647Z"}]}}