{"id":"UBUNTU-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":"2026-09-11T15:00:24.243094128Z","published":"2026-02-27T04:16:00Z","upstream":["CVE-2026-28364"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-28364"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-28364"},{"type":"REPORT","url":"https://osv.dev/vulnerability/OSEC-2026-01"},{"type":"REPORT","url":"https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.json"}],"affected":[{"package":{"name":"ocaml","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/ocaml?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.12.1-4ubuntu1","4.01.0-3ubuntu2","4.01.0-3ubuntu3","4.01.0-3ubuntu3.1","4.01.0-3ubuntu3.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.01.0-3ubuntu3.1+esm1","binary_name":"camlp4"},{"binary_name":"camlp4-extra","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_name":"ocaml","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_name":"ocaml-base","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_name":"ocaml-base-nox","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_version":"4.01.0-3ubuntu3.1+esm1","binary_name":"ocaml-compiler-libs"},{"binary_name":"ocaml-interp","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_name":"ocaml-mode","binary_version":"4.01.0-3ubuntu3.1+esm1"},{"binary_version":"4.01.0-3ubuntu3.1+esm1","binary_name":"ocaml-native-compilers"},{"binary_version":"4.01.0-3ubuntu3.1+esm1","binary_name":"ocaml-nox"},{"binary_version":"4.01.0-3ubuntu3.1+esm1","binary_name":"ocaml-source"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ocaml?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.01.0-4ubuntu1","4.02.3-5ubuntu1","4.02.3-5ubuntu2","4.02.3-5ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ocaml","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_name":"ocaml-base","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_name":"ocaml-base-nox","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_name":"ocaml-compiler-libs","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_version":"4.02.3-5ubuntu2+esm1","binary_name":"ocaml-interp"},{"binary_name":"ocaml-mode","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_name":"ocaml-native-compilers","binary_version":"4.02.3-5ubuntu2+esm1"},{"binary_version":"4.02.3-5ubuntu2+esm1","binary_name":"ocaml-nox"},{"binary_version":"4.02.3-5ubuntu2+esm1","binary_name":"ocaml-source"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ocaml?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.04.0-2ubuntu4","4.05.0-10ubuntu1","4.05.0-10ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ocaml","binary_version":"4.05.0-10ubuntu1+esm1"},{"binary_name":"ocaml-base","binary_version":"4.05.0-10ubuntu1+esm1"},{"binary_version":"4.05.0-10ubuntu1+esm1","binary_name":"ocaml-base-nox"},{"binary_version":"4.05.0-10ubuntu1+esm1","binary_name":"ocaml-compiler-libs"},{"binary_name":"ocaml-interp","binary_version":"4.05.0-10ubuntu1+esm1"},{"binary_name":"ocaml-mode","binary_version":"4.05.0-10ubuntu1+esm1"},{"binary_name":"ocaml-nox","binary_version":"4.05.0-10ubuntu1+esm1"},{"binary_version":"4.05.0-10ubuntu1+esm1","binary_name":"ocaml-source"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ocaml?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.05.0-12ubuntu3","4.08.1-8"],"ecosystem_specific":{"binaries":[{"binary_name":"ocaml","binary_version":"4.08.1-8"},{"binary_version":"4.08.1-8","binary_name":"ocaml-base"},{"binary_version":"4.08.1-8","binary_name":"ocaml-base-nox"},{"binary_version":"4.08.1-8","binary_name":"ocaml-compiler-libs"},{"binary_name":"ocaml-interp","binary_version":"4.08.1-8"},{"binary_version":"4.08.1-8","binary_name":"ocaml-man"},{"binary_version":"4.08.1-8","binary_name":"ocaml-nox"},{"binary_version":"4.08.1-8","binary_name":"ocaml-source"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28364.json"}},{"package":{"name":"ocaml","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ocaml?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-4","4.11.1-5ubuntu1","4.13.1-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary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