CVE-2026-94301 in MINA
Summary
by MITRE • 09/21/2026
The fix for CVE-2026-47065/ZDRES-232 ("resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy"), released on 2026-06-02 and announced as "Fully addressed" in MINA 2.2.8, 2.1.13 and 2.0.29, was committed to the 2.2.X branch only. The 2.0.X and 2.1.X maintenance branches never received the resolveProxyClass() override, so the 2.0.29 and 2.1.13 artifacts listed as fixed -- and every later release on those lines, up to and including the current 2.0.30 and 2.1.14 -- remain vulnerable to the exact allow-list bypass that CVE-2026-47065 was meant to close.
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Analysis
by VulDB Data Team • 09/21/2026
The vulnerability designated as CVE-2026-47065, also tracked under ZDRES-232, represents a critical security flaw within the Apache MINA framework related to improper handling of Java reflection proxies during deserialization processes. The core technical issue stems from the failure to override the resolveProxyClass method in specific maintenance branches of the library. This omission allows an attacker to bypass allow-list filters that are designed to restrict which classes can be instantiated or manipulated via java.lang.reflect.Proxy objects. By exploiting this gap, a malicious actor can construct crafted serialized payloads that leverage proxy mechanisms to instantiate arbitrary classes not present on the approved list, effectively neutralizing the intended security controls and enabling remote code execution under certain configuration conditions.
The severity of this vulnerability is compounded by significant errors in the vendor's release management and patching strategy for MINA versions 2.0.x and 2.1.x. Although version numbers such as 2.0.29 and 2.1.13 were publicly announced as fully addressing CVE-2026-47065, a technical audit reveals that the necessary code fix was committed exclusively to the development branch for MINA 2.2.X. Consequently, all artifacts released under the older maintenance lines, including versions up through 2.0.30 and 2.1.14, remain unpatched and vulnerable. This discrepancy creates a dangerous false sense of security for organizations that have upgraded to these specific minor releases believing they are protected against this class of deserialization attacks. The operational impact is severe, as any application relying on affected versions remains exposed to allow-list bypass techniques that can lead to full system compromise if the framework processes untrusted serialized data.
From a classification perspective, this vulnerability aligns with CWE-20 Improper Input Validation and CWE-501 Trust Boundary Violation, specifically within the context of Java deserialization flaws where input is not adequately validated against an allow-list before processing. In terms of offensive security tactics, this flaw facilitates techniques associated with MITRE ATT&CK Tactic TA0004 Privilege Escalation and TA0005 Defense Evasion, as it allows attackers to bypass application-level controls that are intended to restrict class loading and execution paths. The ability to use java.lang.reflect.Proxy objects to circumvent security filters is a sophisticated technique often employed in advanced persistent threats targeting Java-based enterprise applications.
To mitigate this risk, organizations must immediately audit their dependency trees for any usage of Apache MINA versions 2.0.x or 2.1.x up to the latest available releases on those branches. Since no patch exists for these lines, the only effective remediation is to upgrade to a version from the 2.2.X branch where the resolveProxyClass override has been correctly implemented and verified. Alternatively, if upgrading is not immediately feasible due to compatibility constraints, organizations should implement strict input validation at the application layer to prevent untrusted data from reaching the MINA deserialization components. Additionally, enabling Java Security Manager policies or using serialization filters that enforce allow-lists at a lower level in the JVM can provide an additional layer of defense against proxy-based bypass attempts until a proper upgrade can be executed.