Vulnerability · Published Apr 27, 2026 · Assigned by apache
CVE-2026-41635Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE
Critical 9.8
In plain English
A critical-severity unsafe deserialization in Apache MINA from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mina | no fix listed | DEBIAN-CVE-2026-41635 |
| Debian:12 | mina2 | no fix listed | DEBIAN-CVE-2026-41635 |
| Debian:13 | mina2 | no fix listed | DEBIAN-CVE-2026-41635 |
| Debian:14 | mina2 | 2.2.9-1 | DEBIAN-CVE-2026-41635 |
| Maven | org.apache.mina:mina-core | 2.0.28 | GHSA-8297-v2rf-2p32 |
| Maven | org.apache.mina:mina-core | 2.1.11 | GHSA-8297-v2rf-2p32 |
| Maven | org.apache.mina:mina-core | 2.2.6 | GHSA-8297-v2rf-2p32 |
| Ubuntu:22.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-41635 |
| Ubuntu:24.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-41635 |
| Ubuntu:25.10 | mina2 | no fix listed | UBUNTU-CVE-2026-41635 |
| Ubuntu:26.10 | mina2 | no fix listed | UBUNTU-CVE-2026-41635 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache MINA | 2.2.0 – through 2.2.52.1.0 – through 2.1.102.0.0 – through 2.0.27 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H