CVE-2026-28364
Modified
Modified - Updated After Analysis
Buffer Over-Read in OCaml Marshal Enables Remote Code Execution
Vulnerability report for CVE-2026-28364, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-02-27
Last updated on: 2026-06-30
Assigner: MITRE
Description
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 Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| ocaml | ocaml | to 4.14.3 (exc) |
| ocaml | ocaml | From 5.0.0 (inc) to 5.4.1 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-126 | The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer. |
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
