External risk intelligence

Apache MINA lets attackers take control of services or steal data

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-41635

An external attacker can exploit a flaw in Apache MINA to bypass security protections by sending malicious network data. This allows them to execute unauthorized commands and potentially gain complete administrative control over the affected servers.

3Halo Surface Signal

Deserialization

Apache Mina

2.0.0 to before 2.0.282.1.0 to before 2.1.112.2.0 to before 2.2.6

External exposure likelihood

Halo Surface Signal score for CVE-2026-41635

Apache MINA is a network application framework used for diverse services, ranging from internal backends to public-facing network listeners. Because the flaw exists within the library code and requires an application to process untrusted network data using specific methods, the public exposure level varies significantly based on the specific application implementation.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Apache MINA's buffer handling allows for arbitrary code execution if an application deserializes untrusted data. This could let attackers take control of systems that process network data through specific MINA functions.

  • Executing arbitrary code is a high-impact risk.
  • Affects applications using Apache MINA's `IoBuffer.getObject()`.
  • Attack requires network access to the vulnerable application.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted data to an application using vulnerable Apache MINA versions. If the application processes this data using `IoBuffer.getObject()`, the attacker can bypass class filtering and execute arbitrary code on the server. This allows for a complete system compromise.

  • Network accessible
  • Data processing required
  • No authentication needed

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Apache MINA's `resolveClass` method allows for arbitrary code execution due to improper class validation. Attackers are likely to target this because it provides a direct path to compromise systems without requiring user interaction or prior authentication, especially in network-facing applications. The exploitability is amplified by the nature of network application frameworks that often handle untrusted input.

  • Remote code execution possible.
  • No public exploit observed yet.
  • Recent vulnerability publication.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching or upgrading all instances of Apache MINA to the latest fixed versions, as this vulnerability allows for arbitrary code execution with no authentication required. If immediate patching is not feasible, isolate affected services from untrusted network traffic to prevent exploitation.

  • Upgrade Apache MINA to 2.0.28, 2.1.11, or 2.2.6.
  • Isolate services using vulnerable versions from untrusted networks.
  • Monitor for unusual network traffic related to `IoBuffer.getObject()`.

Frequently asked questions

What is Apache MINA?

Apache MINA is a network application framework that helps developers create network applications. It's used for building a wide range of services, from internal systems to public-facing applications, by handling network communication.

What is the vulnerability in Apache MINA (CVE-2026-41635)?

This vulnerability is an improper deserialization weakness. In certain cases, Apache MINA's `AbstractIoBuffer.resolveClass()` method doesn't properly validate class names before loading them, allowing an attacker to execute arbitrary code.

How can an attacker exploit this Apache MINA vulnerability?

An attacker can exploit this by sending specially crafted data to an application that uses a vulnerable version of Apache MINA and calls `IoBuffer.getObject()`. This bypasses security checks and allows for code execution without needing prior authentication or user interaction.

Who should be concerned about this Apache MINA vulnerability?

Organizations using Apache MINA in applications that process data received over a network should be concerned. This includes services that are internet-facing, as they are more likely to encounter malicious input.

What is the first step to address this CVE in Apache MINA?

The primary step is to upgrade affected Apache MINA installations to a patched version. Specifically, upgrade to 2.0.28, 2.1.11, or 2.2.6. If upgrading immediately isn't possible, isolate the vulnerable services from untrusted network traffic.

References