Apache MINA Deserialization Vulnerability: CVE-2026-41409 Critical Patch Bypass
A critical deserialization vulnerability, CVE-2026-41409, has been identified in Apache MINA, stemming from an incomplete fix for a previous flaw (CVE-2024-52046). According to the National Vulnerability Database, the classname allowlist designed to restrict deserialization was applied too late in AbstractIoBuffer.getObject(). This allowed static initializers in malicious classes to execute before the allowlist could prevent their deserialization, bypassing the intended security control.
This flaw affects Apache MINA versions 2.0.0 through 2.0.27, 2.1.0 through 2.1.10, and 2.2.0 through 2.2.5. The National Vulnerability Database confirms that any application leveraging Apache MINA and calling IoBuffer.getObject() is at risk. The fix, available in Apache MINA 2.0.28, 2.1.11, and 2.2.6, involves applying the classname allowlist earlier in the deserialization process.
With a CVSS score of 9.8 (Critical), this vulnerability represents a severe remote code execution risk. An attacker can exploit this without authentication (AV:N, PR:N, UI:N) to achieve full compromise (C:H, I:H, A:H). This is a classic deserialization attack (CWE-502), a vector known for its potency and difficulty to fully mitigate without strict controls.
What This Means For You
- If your organization uses Apache MINA, you need to identify all applications that call `IoBuffer.getObject()` immediately. This isn't theoretical; this is a critical remote code execution vulnerability that allows attackers to bypass security controls. Prioritize upgrading to Apache MINA 2.0.28, 2.1.11, or 2.2.6. If direct upgrade isn't feasible, isolate affected systems and implement compensating controls to restrict network access.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Apache MINA Deserialization Bypass Attempt (CVE-2026-41409)
title: Apache MINA Deserialization Bypass Attempt (CVE-2026-41409)
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-41409 by targeting the Apache MINA AbstractIoBuffer.getObject() method. The vulnerability allows deserialization of arbitrary classes due to an incomplete allowlist check. This rule looks for specific URI patterns indicative of an attempt to trigger this deserialization vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41409/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/mina/IoBuffer.getObject()'
cs-uri-query|contains:
- 'className='
condition: cs-uri AND cs-uri-query
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41409 | Vulnerability | CVE-2026-41409 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 13:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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