{"cve":"CVE-2026-28364","nvd":{"published":"2026-02-27T04:16:03.410","modified":"2026-07-15T02:19:14.497","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-126","CWE-125"],"references":["https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.json","https://osv.dev/vulnerability/OSEC-2026-01","https://access.redhat.com/security/cve/CVE-2026-28364","https://bugzilla.redhat.com/show_bug.cgi?id=2443348","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28364.json"],"products":["ocaml:ocaml"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-28364","score":0.00241,"percentile":0.15267,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}