{"id":"CVE-2026-89086","title":"In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.","summary":"In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-347"],"vendor":"OCaml","product":"jose","affected":["jose < 0.11.0"],"published":"2026-09-10","updated":"2026-09-10","sourceUpdated":"2026-09-10T21:17:52.570","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89086","references":[{"url":"https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e","label":"cve@mitre.org"},{"url":"https://osv.dev/vulnerability/OSEC-2026-19","label":"cve@mitre.org"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-10T20:40:09.935199Z"},"ingestedAt":"2026-09-14T14:09:30.520Z","epss":0.00198,"epssPercentile":0.09896,"slug":"CVE-2026-89086","body":"## Overview\n\nIn the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":56246,"id":"CVE-2026-89086","ts":1789074389966,"field":"exploit_available","old":"false","new":"true"}]}