# CVE-2026-41635: mina2: Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive typ...

CVE-2026-41635 is fixed in mina2 on 1 platform by DEBIAN-CVE-2026-41635 (version 2.2.9-1), released April 27, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-41635
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 27, 2026

## 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 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and   2.2.0 <= 2.2.5.      The problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by  applying the classname allowlist earlier.      Affected are applications using Apache MINA that call  IoBuffer.getObject().      Applications using Apache MINA are advised to upgrade.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mina2 Debian 14 | 2.2.9-1 | [DEBIAN-CVE-2026-41635](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41635.md) | Apr 27, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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