---
title: "CVE-2026-47065: Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass"
url: https://erroneo.us/security/cve/CVE-2026-47065/
description: "CVE-2026-47065 (org.apache.mina:mina-core (Maven)): ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-03
date_modified: 2026-07-13
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-47065"
kev: false
cvss: 9.8
epss: 0.00504
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-47065: Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 42: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 42% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.mina:mina-core (Maven) >= 2.2.0, < 2.2.8, fixed in 2.2.8 ; org.apache.mina:mina-core (Maven) >= 2.1.0, < 2.1.13, fixed in 2.1.13 ; org.apache.mina:mina-core (Maven) < 2.0.29, fixed in 2.0.29 . Check your lockfile, including transitive dependencies.

## What it is

ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy Assessment: Fully addressed. When the serialised stream contains a TCPROXYCLASSDESC (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 of SomeClass — and many real-world classes have side-effecting static initialisers Both issues have been fixed.

## Affected packages

- Maven `org.apache.mina:mina-core` >= 2.2.0, < 2.2.8 → fixed: 2.2.8
- Maven `org.apache.mina:mina-core` >= 2.1.0, < 2.1.13 → fixed: 2.1.13
- Maven `org.apache.mina:mina-core` < 2.0.29 → fixed: 2.0.29

## Affected products (CVE record)

- Apache Software Foundation Apache MINA: 2.2.0 < 2.2.8, 2.1.0 < 2.1.13, 2.0.0 < 2.0.29

## Severity

- apache CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.50% probability of exploitation activity in the next 30 days; percentile 42.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/y7xj1bl8qo47p9bktb11hg5v6k1d4dyj)
- [GitHub Advisory GHSA-v3pr-hxpr-mfm8](https://github.com/advisories/GHSA-v3pr-hxpr-mfm8)
- [CVE.org record CVE-2026-47065](https://www.cve.org/CVERecord?id=CVE-2026-47065)
- [NVD entry CVE-2026-47065](https://nvd.nist.gov/vuln/detail/CVE-2026-47065)

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Source page: https://erroneo.us/security/cve/CVE-2026-47065/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt