CVE-2026-41635: Critical Apache MINA RCE bypasses allowlist
The National Vulnerability Database (NVD) has detailed a critical RCE vulnerability, CVE-2026-41635, in Apache MINA’s AbstractIoBuffer.resolveClass() method. The issue stems from an incomplete class validation process. Specifically, a code path intended for static classes or primitive types fails to check the class name against an allowlist, allowing an attacker to bypass security controls and potentially execute arbitrary code.
This vulnerability impacts applications utilizing 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, particularly those that invoke IoBuffer.getObject(). The CVSS score of 9.8 highlights the severity, indicating a network-exploitable flaw with high impact across confidentiality, integrity, and availability. The NVD classifies this under CWE-502: Deserialization of Untrusted Data.
Defenders must prioritize patching affected Apache MINA installations to versions 2.0.28, 2.1.11, or 2.2.6, where the classname allowlist is enforced earlier in the deserialization process. For organizations unable to patch immediately, reviewing application configurations and auditing logs for suspicious deserialization activity related to IoBuffer.getObject() calls is crucial. The attacker’s calculus is simple: exploit a known deserialization weakness in a widely used library to gain initial access or execute commands within vulnerable systems.
What This Means For You
- If your organization uses Apache MINA versions 2.0.0-2.0.27, 2.1.0-2.1.10, or 2.2.0-2.2.5, immediately upgrade to the patched versions (2.0.28, 2.1.11, or 2.2.6). Failure to do so exposes your systems to critical RCE attacks via deserialization vulnerabilities.
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.
CVE-2026-41635: Apache MINA IoBuffer.getObject() RCE Attempt
title: CVE-2026-41635: Apache MINA IoBuffer.getObject() RCE Attempt
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-41635 by targeting the IoBuffer.getObject() method in vulnerable Apache MINA versions. The vulnerability allows for arbitrary code execution by bypassing classname allowlists when deserializing objects. This detection looks for specific URI patterns that might indicate an exploit attempt targeting this functionality.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41635/
tags:
- attack.initial_access
- attack.t1505.003
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/mina/iobuffer'
cs-uri-query|contains:
- 'getObject'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41635 | Vulnerability | CVE-2026-41635 |
| CVE-2026-41635 | Affected Product | the accepted class filter |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 12:16 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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