{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"libressl/portable","product":"LibreSSL","source":"CNA: VulnCheck","vendor":"OpenBSD","versions":[{"lessThanOrEqual":"4.4.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-118374","cwes":["CWE-770"],"description":"LibreSSL ocspcheck through 4.4.0 contains a memory exhaustion vulnerability that allows malicious OCSP responders to exhaust memory by sending unbounded HTTP responses. Attackers controlling the responder or intercepting plain HTTP AIA OCSP traffic can stream endless headers or body data to http_head_read() and http_body_read(), denying certificate status checks.","epss":{"date":"2026-11-02","percentile":0.11444,"score":0.00212},"exploits":[],"kev":null,"metrics":[{"score":8.2,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793649476079,"publishedAt":1793153002183,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/openbsd/src/blob/f6f428241d469cf434e60b73fc834d0448f068d5/usr.sbin/ocspcheck/http.c#L419"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/libressl/portable"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-memory-exhaustion-via-unbounded-ocsp-http-response"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openbsd/src/commit/bf5da63f53179ef423d18c56d6da89eaefb56228"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openbsd/src/commit/de4274c56c9ace88232591d4c919d79281a8de59"}],"revision":"aaa3ba847deef3d8566e88b6486c1b3b0fb781da8e648344bceb9eaab05dace1","sources":[{"modifiedAt":1793649476079,"name":"CNA: VulnCheck","retrievedAt":1793650263859,"url":"https://www.cve.org/CVERecord?id=CVE-2026-118374"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793650305236,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-118374"}],"ssvc":{"assessedAt":1793649456350,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response","updatedAt":1793650305236}