CVE-2026-47065 Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass - ZDRES-232
Attackers can bypass deserialization allow-lists in Apache MINA to execute arbitrary code via proxy class resolution or static initializers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47065?
CVE-2026-47065 is a critical unsafe deserialization vulnerability in Apache MINA, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy
Assessment: Fully addressed.
When the serialised stream contains a TC_PROXYCLASSDESC (the marker for a java.lang.reflect.Proxy ), JDK’s ObjectInputStream.readProxyDesc() is dispatched. JDK then calls the default ObjectInputStream.resolveProxyClass(interfaces) implementation, which performs Class.forName(intf, false, latestUserDefinedLoader()) for EACH interface name and constructs the proxy class — bypassing the accepted classes list .
ZDRES-233: Class.forName(name, initialize=true, classLoader) in readClassDescriptor Triggers Static Initialiser of Allow-Listed Classes
Assessment: Fully addressed.
For ANY class on the allow-list, deserialising a stream that names it triggers the class’s (static initialiser) BEFORE any instance is constructed. This means an attacker who supplies a class name on the allow-list (e.g., the developer wrote accept(“com.myapp.*") , attacker supplies com.myapp.SomeClass ) causes <clinit> of SomeClass — and many real-world classes have side-effecting static initialisers
Both issues have been fixed.
Weakness: CWE-502
Which versions are affected by CVE-2026-47065?
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 | All versions | 2.0.29 |
org.apache.mina:mina-core Maven | All versions | 2.0.29 |
org.apache.mina:mina-core Maven | From 2.1.0 | 2.1.13 |
org.apache.mina:mina-core Maven | From 2.1.0 | 2.1.13 |
org.apache.mina:mina-core Maven | From 2.2.0 | 2.2.8 |
org.apache.mina:mina-core Maven | From 2.2.0 | 2.2.8 |
Products include Apache Mina.
How do I fix CVE-2026-47065?
Upgrade org.apache.mina:mina-core to a fixed version for your release line: 2.0.29, 2.1.13 or 2.2.8.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-47065 being exploited?
There is no known exploitation of CVE-2026-47065 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-2026-42778 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
- CVE-2026-41635 Apache MINA vulnerable to Deserialization of Untrusted Data
Sources
Also known as CLEANSTART-2026-PH37738, CLEANSTART-2026-RP24117, CLEANSTART-2026-UQ61824, CLEANSTART-2026-YS57546, DEBIAN-CVE-2026-47065, ECHO-5c2d-11c4-126d and 13 more.