{"id":"CVE-2026-118371","state":"PUBLISHED","title":"LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line","description":"LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies.","publishedAt":"2026-10-28T02:03:20.152Z","updatedAt":"2026-10-28T02:03:20.152Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["OpenBSD LibreSSL"],"affected":[{"vendor":"OpenBSD","product":"LibreSSL","packageURL":"pkg:github/libressl/portable","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.4.0","versionType":"semver"}],"repo":"https://github.com/libressl/portable"}],"references":["https://github.com/openbsd/src/commit/d3f7195f4849d8a699cea4a3a67677f4b3dc1591","https://github.com/openbsd/src/blob/3903c41d301d66facec69f7bf776b182cbc5ed62/lib/libcrypto/ocsp/ocsp_ht.c#L184","https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","https://github.com/libressl/portable","https://www.vulncheck.com/advisories/libressl-through-4.4.0-crlf-injection-via-ocsp-sendreq-new-request-line"],"weaknesses":["CWE-93"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118371.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118371","state":"PUBLISHED","datePublished":"2026-10-28T02:03:20.152Z","dateUpdated":"2026-10-28T02:03:20.152Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-28T01:19:19.814Z"},"containers":{"cna":{"title":"LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line","descriptions":[{"lang":"en","value":"LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies."}],"affected":[{"vendor":"OpenBSD","product":"LibreSSL","packageURL":"pkg:github/libressl/portable","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.4.0","versionType":"semver"}],"repo":"https://github.com/libressl/portable"}],"references":[{"url":"https://github.com/openbsd/src/commit/d3f7195f4849d8a699cea4a3a67677f4b3dc1591","tags":["patch"]},{"url":"https://github.com/openbsd/src/blob/3903c41d301d66facec69f7bf776b182cbc5ed62/lib/libcrypto/ocsp/ocsp_ht.c#L184","tags":["technical-description"]},{"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt","tags":["release-notes"],"name":"LibreSSL 4.4.0 Release Notes"},{"url":"https://github.com/libressl/portable","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/libressl-through-4.4.0-crlf-injection-via-ocsp-sendreq-new-request-line","name":"VulnCheck Advisory: LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-93","lang":"en","description":"Improper Neutralization of CRLF Sequences ('CRLF Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-28T02:03:20.152Z"},"datePublic":"2026-10-20T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:*","versionEndIncluding":"4.4.0"}]}]}],"credits":[{"lang":"en","value":"Aziz Elbelaychy (Ostorlab)","type":"finder"},{"lang":"en","value":"Theo Buehler","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}