{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-45389: In OCaml-TLS before 2","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-45389","status":"final","version":"1","initial_release_date":"2026-06-15T00:00:00.000Z","current_release_date":"2026-06-16T13:56:44.473Z","revision_history":[{"date":"2026-06-15T00:00:00.000Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client (when doing client authentication), which allows impersonation with certificates that are not meant for client authentication (because of KeyUsage and ExtendedKeyUsage).","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-45389 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-45389"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-45389"},{"category":"external","summary":"osv.dev","url":"https://osv.dev/vulnerability/OSEC-2026-07"}]},"product_tree":{"branches":[{"category":"vendor","name":"n/a","branches":[{"category":"product_name","name":"n/a","branches":[{"category":"product_version","name":"n/a","product":{"name":"n/a n/a n/a","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:n\\/a:n\\/a:n\\/a:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-45389","title":"In OCaml-TLS before 2","notes":[{"category":"description","text":"In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client (when doing client authentication), which allows impersonation with certificates that are not meant for client authentication (because of KeyUsage and ExtendedKeyUsage).","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}