CVE-2026-28364
Last modified
CVE-2026-28364 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ocaml | Ocaml | < 4.14.3 |
| Ocaml | Ocaml | >= 5.0.0, < 5.4.1 |
References
- https://osv.dev/vulnerability/OSEC-2026-01Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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