{"id":"DEBIAN-CVE-2026-28364","details":"In OCaml before 4.14.3 and 5.x before 5.4.1, a buffer over-read in Marshal deserialization (runtime/intern.c) enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock() function, which performs unbounded memcpy() operations using attacker-controlled lengths from crafted Marshal data.","modified":"2026-09-14T17:03:24.931915110Z","published":"2026-02-27T04:16:03.410Z","upstream":["CVE-2026-28364"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-28364"}],"affected":[{"package":{"name":"ocaml","ecosystem":"Debian:12","purl":"pkg:deb/debian/ocaml?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.13.1-4","4.13.1-5","4.13.1-5~exp1","4.13.1-6","4.14.1-1","4.14.1-1+loong64.2","4.14.1-1~exp1","5.2.0-1","5.2.0-1~exp1","5.2.0-1~exp2","5.2.0-1~exp3","5.2.0-1~exp4","5.2.0-2","5.2.0-3","5.2.0-3+hurd.1","5.2.0-3+hurd.2","5.3.0-1","5.3.0-1+hurd.1","5.3.0-1~exp1","5.3.0-1~exp2","5.3.0-2","5.3.0-3","5.4.0-1","5.4.0-1~exp1","5.4.0-1~exp2","5.4.0-1~exp3","5.4.0-2","5.4.0-3","5.4.1-1","5.4.1-1~exp1","5.5.0-1~exp1","5.5.0-1~exp2","5.5.1-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Debian:13","purl":"pkg:deb/debian/ocaml?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-3","5.4.0-1","5.4.0-1~exp1","5.4.0-1~exp2","5.4.0-1~exp3","5.4.0-2","5.4.0-3","5.4.1-1","5.4.1-1~exp1","5.5.0-1~exp1","5.5.0-1~exp2","5.5.1-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Debian:14","purl":"pkg:deb/debian/ocaml?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.1-1"}]}],"versions":["5.3.0-3","5.4.0-1","5.4.0-1~exp1","5.4.0-1~exp2","5.4.0-1~exp3","5.4.0-2","5.4.0-3","5.4.1-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28364.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}