{"id":"CVE-2026-87737","aliases":["DEBIAN-CVE-2026-87737","EUVD-2026-74623","GHSA-qmhp-mcqx-7ppw","OSEC-2026-17","UBUNTU-CVE-2026-87737"],"status":"published","title":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing...","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00332,"percentile":0.2666,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-208"],"published":"2026-08-17T09:45:00Z","modified":"2026-11-06T13:45:06Z","fixes":[{"ecosystem":"Debian:14","package":"ocaml-mirage-crypto","fixed_in":["2.4.0-1"],"sources":["osv"]},{"ecosystem":"opam","package":"mirage-crypto-ec","fixed_in":["2.4.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.7-1","0.11.1-1","0.11.1-2","0.11.1-3","0.11.2-1","0.11.2-2","0.11.3-1","1.1.0-1","1.1.0-2","2.0.0-1","2.0.1-1","2.0.2-1","2.0.3-1","2.1.0-1","2.2.0-1","2.2.0-2","2.3.0-1","2.4.0-1","2.4.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0-1","2.0.1-1","2.0.2-1","2.0.3-1","2.1.0-1","2.2.0-1","2.2.0-2","2.3.0-1","2.4.0-1","2.4.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0-1"}]}],"versions":["2.0.0-1","2.0.1-1","2.0.2-1","2.0.3-1","2.1.0-1","2.2.0-1","2.2.0-2","2.3.0-1"]},{"source":"osv","ecosystem":"opam","package":"mirage-crypto-ec","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.11.3"},{"fixed":"2.4.0"}]}],"versions":["0.11.3","1.0.0","1.1.0","1.2.0","2.0.0","2.0.1","2.0.2","2.0.3","2.1.0","2.2.0","2.3.0"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.5-4","0.10.5-4build2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.1-3","0.11.2-1","0.11.2-1build1","0.11.2-2build3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.2-1build5","2.4.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ocaml-mirage-crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.1-1build1","2.0.2-1build1","2.0.2-1build2","2.0.2-1build3","2.0.2-1build5"]}],"products":[{"vendor":"ocaml","product":"mirage-crypto-ec"}],"references":[{"url":"https://osv.dev/vulnerability/OSEC-2026-17","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87737"},{"url":"https://github.com/advisories/GHSA-qmhp-mcqx-7ppw"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-87737","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-87737","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87737","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-87737","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T04:21:37.602Z","modified":"2026-09-09T13:10:11.317Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T13:37:47.463822Z"}],"euvd":[{"id":"EUVD-2026-74623","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T04:21:37Z","modified":"2026-09-09T13:10:11Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T17:28:27.763941Z"}],"ghsa":[{"id":"GHSA-qmhp-mcqx-7ppw","title":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing...","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T06:31:39Z","modified":"2026-09-09T06:31:47Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:11:37.523128Z"}],"nvd":[{"id":"CVE-2026-87737","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T05:18:21.02Z","modified":"2026-09-09T16:04:24.933Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:12:45.93749Z"}],"osv":[{"id":"DEBIAN-CVE-2026-87737","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T05:18:21.02Z","modified":"2026-10-01T03:03:52.533924328Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:46:05.506112Z"},{"id":"OSEC-2026-17","title":"Timing leak in NIST elliptic curves scalar multiplication","description":"The scalar multiplication includes pre-computed tables for speedup (introduced in mirage-crypto-ec 0.11.3). The lookup algorithm for these tables performs secret-dependent reads instead of scanning the entire table.\n\n## Solution\n\nInstead of using the index `n - 1`, where `n` is secret-dependent, use `i - 1`, as done in the Go reference implementation. If `n` is 0, there is a out-of-bounds read before the patch.\n\n## Timeline\n- 2026-08-12: report by Eric Ebinger to security@ocaml.org\n- 2026-08-17: release of mirage-crypto-ec 2.4.0 and this advisory","status":"published","published":"2026-08-17T09:45:00Z","modified":"2026-11-06T19:14:09.744122401Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-06T19:35:46.290134Z"},{"id":"UBUNTU-CVE-2026-87737","description":"An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.","status":"published","published":"2026-09-09T05:18:00Z","modified":"2026-10-17T13:01:15.415142304Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:57:24.828975Z"}]}}