---
cve: "CVE-2026-28364"
severity: "HIGH"
cvss: 7.9
epss: "0.2%"
vendor: "OCaml"
kev: false
exploited: false
published: "2026-02-27 04:16:03"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T12:27:23+02:00"
---

# CVE-2026-28364

> 7.9 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- ce529ce4255a8a057357647fe385c03b0132fdbe (Commit)
- 152d7ca5dd2c67ecfece73f91aea5697f95178a5 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-28364) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_