---
cve: "CVE-2026-86404"
severity: "HIGH"
cvss: 8.8
epss: "0.5%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-09-07 12:17:21"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T17:21:52+02:00"
---

# CVE-2026-86404

> 8.8 HIGH

## Beschreibung

EAP's Artemis deserialization configuration permits deserialization by default. ObjectMessage.getObject() uses ObjectInputStreamWithClassLoader, which implements allow-list/block-list filtering via its checkSecurity()/isTrustedType() method. However, by default both allow-list and block-list are empty. When the allow-list is empty (size == 0), isTrustedType() returns true for ALL classes. This means all classes are deserializable by default.

## CVSS-Vektor

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

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

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:53644>
- <https://access.redhat.com/security/cve/CVE-2026-86404>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2477930>
- <https://access.redhat.com/errata/RHSA-2026:53645>
- <https://access.redhat.com/errata/RHSA-2026:53646>
- <https://access.redhat.com/errata/RHSA-2026:53806>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-86404) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_