CVE-2026-28364

HIGH

7.9

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.

CVE Details

CVSS v3.1 Score7.9

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/27/2026

Last Modified3/6/2026

Sourcenvd

Honeypot Sightings0

Affected Products

ocaml:ocaml

Weaknesses (CWE)

CWE-126

References

https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.json(cve@mitre.org)

https://osv.dev/vulnerability/OSEC-2026-01(cve@mitre.org)

IOC Correlations

No correlations recorded

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