---
cve: "CVE-2026-42779"
severity: "CRITICAL"
cvss: 9.8
epss: "90%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2026-05-01 11:16:19"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T22:16:22+02:00"
---

# CVE-2026-42779

> 9.8 CRITICAL

## Beschreibung

The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description:











Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed.




The fix checks if the class is present in the accepted class filter before calling Class.forName(). 






Affected versions are Apache MINA 2.1.0

## CVSS-Vektor

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

| 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 | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- ddb1495e8483e7dc6f257419a356b87cb3929912 (Commit)
- a2fa7504ddff446a6cb93862f4517a6ca74b07cd (Commit)

## Referenzen

- <https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42779) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_