CVE-2026-47065
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Proxy Class Deserialization Bypass in Apache Commons

Publication date: 2026-06-03

Last updated on: 2026-06-03

Assigner: Apache Software Foundation

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.
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Meta Information
Published
2026-06-03
Last Modified
2026-06-03
Generated
2026-06-23
AI Q&A
2026-06-03
EPSS Evaluated
2026-06-22
NVD
CVE-2026-47065
EUVD
EUVD-2026-34069
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
apache commons_lang *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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Executive Summary

This vulnerability involves the Java deserialization process in the Apache Commons Lang library. Specifically, when deserializing a serialized stream containing a java.lang.reflect.Proxy class, the method ObjectInputStream.resolveProxyClass is called. This method uses Class.forName to load each interface of the proxy class, bypassing the list of accepted classes, which can allow an attacker to bypass security filters.

Additionally, for any class on the allow-list, deserializing a stream that names it triggers the class's static initializer before any instance is constructed. Since many real-world classes have static initializers with side effects, this can be exploited by an attacker who supplies a class name on the allow-list.

Both issues have been fully addressed in the fix.

Impact Analysis

This vulnerability can have severe impacts as indicated by its high CVSS score of 9.8. An attacker can bypass security filters during deserialization, potentially leading to remote code execution or other malicious actions without any privileges or user interaction.

Triggering static initializers of allow-listed classes can cause unintended side effects, which might be exploited to compromise the application’s integrity, confidentiality, and availability.

Mitigation Strategies

The vulnerability described as ZDRES-232 and ZDRES-233 in the Apache Commons Lang library has been fully addressed.

To mitigate this vulnerability, ensure that you update to the fixed version of the affected software where these issues have been resolved.

Since the vulnerability involves deserialization bypasses via java.lang.reflect.Proxy and static initializers triggered during deserialization, applying the official patches or upgrading to a version that includes these fixes is the immediate recommended step.

Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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