External risk intelligence

Attacker can control services that use Apache MINA by sending malicious data.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-42778

A security flaw in Apache MINA could let attackers run harmful code on your services by sending specially crafted data, demanding prompt attention for affected applications.

3Halo Surface Signal

Deserialization

Apache Mina

2.1.0 to before 2.1.122.2.0 to before 2.2.7

External exposure likelihood

Halo Surface Signal score for CVE-2026-42778

The vulnerability exists in a network communication library. While applications built with this framework may be exposed to the internet, the specific vulnerable function requires the application to process user-supplied serialized Java objects. This implementation pattern is plausible in internet-facing services but is not the default or universal design for all network applications.

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in Apache MINA concerns a flaw in how data is deserialized, potentially allowing unauthorized code execution. This is critical because it impacts the security of applications using this library and could be exploited remotely.

  • Can lead to unauthorized code execution.
  • Affects applications using `IoBuffer.getObject()`.
  • Exploitable over the network.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this by sending crafted serialized Java objects to an application using the vulnerable Apache MINA library. This bypasses the intended class allowlist, allowing deserialization of arbitrary, potentially malicious classes. This can lead to remote code execution on the server hosting the application.

  • Target vulnerable applications using specific MINA versions.
  • Exploit via deserialization of untrusted input.
  • Requires application to call `IoBuffer.getObject()`.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability involves incomplete deserialization protection in a network communication library, potentially allowing attackers to execute arbitrary code if applications use the vulnerable function with untrusted input. While the library is used in network-facing applications, exploitation relies on a specific pattern of using deserialization, which might not be universally adopted. There is no immediate indication of widespread weaponization.

  • No known public exploit.
  • Not on KEV.
  • Published relatively recently.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize upgrading Apache MINA to versions 2.1.12 or 2.2.7 for applications that use `IoBuffer.getObject()`. If immediate patching is not feasible, focus on isolating affected services to prevent potential remote code execution.

  • Upgrade to Apache MINA 2.1.12 or 2.2.7.
  • Monitor logs for deserialization activity.
  • Isolate vulnerable services.

Frequently asked questions

What is Apache MINA?

Apache MINA is a network application framework that helps users develop network applications. It is used for creating network services that handle communication over various protocols, such as TCP and UDP.

What is the weakness in CVE-2026-42778?

CVE-2026-42778 is related to an incomplete fix for a deserialization vulnerability (CWE-502). In Apache MINA's AbstractIoBuffer.getObject(), the protection mechanism that allowed only specific classes to be deserialized was applied too late, potentially after malicious code had already been executed.

How can an attacker exploit CVE-2026-42778?

An attacker could exploit this vulnerability by sending specially crafted serialized Java objects to an application using a vulnerable version of Apache MINA. This is only possible if the application calls the `IoBuffer.getObject()` method and processes untrusted input.

Who should be concerned about this vulnerability?

Organizations using Apache MINA versions 2.1.0 through 2.1.11 or 2.2.0 through 2.2.6 should be concerned. The Halo Surface Signal indicates this vulnerability has a 'Possible' exposure, meaning it could affect internet-facing services, though exploitation depends on specific application usage patterns.

What is the first step to address this vulnerability?

The primary action is to upgrade your Apache MINA library. For affected versions, update to Apache MINA 2.1.12 or 2.2.7. If an immediate upgrade is not possible, consider isolating the services that use the vulnerable function.

References