---
cve: "CVE-2026-90473"
severity: "MEDIUM"
cvss: 5.3
epss: "3.8%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-12 11:16:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T04:09:16+02:00"
---

# CVE-2026-90473

> 5.3 MEDIUM

## Beschreibung

msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- ca3fa54c8dc3a020ab554a7289af0927bbbf1f62 (Commit)

## Referenzen

- <https://github.com/msgpack/msgpack-java>
- <https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581>
- <https://github.com/msgpack/msgpack-java/issues/1014>
- <https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-90473) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_