{"id":"CVE-2026-87733","title":"An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml","summary":"An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml. The ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets accept 0x00, the encoding of the point at infinity, as a public key. With that public key, signatures…","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-295"],"vendor":"OCaml","product":"mirage-crypto-ec","affected":["mirage-crypto-ec < 2.2.0"],"published":"2026-09-09","updated":"2026-09-09","sourceUpdated":"2026-09-09T16:04:24.933","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87733","references":[{"url":"https://osv.dev/vulnerability/OSEC-2026-13","label":"cve@mitre.org"},{"url":"https://osv.dev/vulnerability/OSEC-2026-13","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-09T13:02:29.178538Z"},"ingestedAt":"2026-09-09T05:00:01.767Z","epss":0.00105,"epssPercentile":0.01192,"slug":"CVE-2026-87733","body":"## Overview\n\nAn issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml. The ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets accept 0x00, the encoding of the point at infinity, as a public key. With that public key, signatures can be forged without a private key.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":16173,"id":"CVE-2026-87733","ts":1788959420562,"field":"exploit_available","old":"false","new":"true"}]}