CVE-2026-41635 Apache MINA vulnerable to Deserialization of Untrusted Data
Attackers can execute arbitrary code via unsafe deserialization in Apache MINA when applications call IoBuffer.getObject().
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41635?
CVE-2026-41635 is a critical unsafe deserialization vulnerability in Apache MINA, published on 27 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-41635?
6 open source packages ship an affected version, including org.apache.mina:mina-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.mina:mina-core Maven | From 2.0.0 | 2.0.28 |
org.apache.mina:mina-core Maven | From 2.0.0 | 2.0.28 |
org.apache.mina:mina-core Maven | From 2.1.0 | 2.1.11 |
org.apache.mina:mina-core Maven | From 2.1.0 | 2.1.11 |
org.apache.mina:mina-core Maven | From 2.2.0 | 2.2.6 |
org.apache.mina:mina-core Maven | From 2.2.0 | 2.2.6 |
Products include Apache Mina.
How do I fix CVE-2026-41635?
Upgrade org.apache.mina:mina-core to a fixed version for your release line: 2.0.28, 2.1.11 or 2.2.6.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-41635 being exploited?
There is no known exploitation of CVE-2026-41635 in the wild and no public exploit code.
Other vulnerabilities in Apache MINA
- CVE-2024-52046 Apache MINA: MINA applications using unbounded deserialization may allow RCE
- CVE-2026-47065 Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass - ZDRES-232
- CVE-2026-42778 Apache MINA: CWE-502 Deserialization of Untrusted Data (take 2)
- CVE-2026-42779 Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41635 Incomplete Fix)
- CVE-2026-41409 Apache MINA: CWE-502 Deserialization of Untrusted Data
Sources
Also known as CLEANSTART-2026-BK50049, CLEANSTART-2026-BT04597, CLEANSTART-2026-GO33321, CLEANSTART-2026-NP40407, CLEANSTART-2026-SQ46621, DEBIAN-CVE-2026-41635 and 13 more.