HIGH 7.9 Microsoft
CVE-2026-28364
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.
Microsoft Security Update 2026-Feb: 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.
Affected Products
- azl3 ocaml 5.1.1-1 on Azure Linux 3.0
- cbl2 ocaml 4.13.1-2 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-28364
- https://nvd.nist.gov/vuln/detail/CVE-2026-28364
This high severity vulnerability with a CVSS score of 7.9 was published on 2026-02-10 via Microsoft. Affected: azl3 ocaml 5.1.1-1 on Azure Linux 3.0, cbl2 ocaml 4.13.1-2 on CBL Mariner 2.0.
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