CVE-2026-42778: Apache MINA Deserialization of Untrusted Data Vulnerability
Summary
CVE-2026-42778: Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41409 Incomplete Fix). Affects org.apache.mina:mina-core across 2 version ranges.
>= 2.1.0, < 2.1.12
>= 2.2.0, < 2.2.7
Fixed in 2.1.12 or 2.2.7, depending on the release line you run. How to fix ↓
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Background
Apache MINA is a popular network application framework that enables developers to create high-performance and scalable network applications easily. It provides a range of features, including support for various transport protocols, asynchronous I/O, and a flexible architecture. However, it has been found to be vulnerable to a deserialization issue that can lead to severe security risks if exploited.
Vulnerability Detail
The vulnerability arises from an incomplete fix for CVE-2026-41409, where the classname allowlist for deserialization was applied too late in the process. This flaw allows untrusted data to be deserialized, potentially leading to remote code execution or other malicious activities. Specifically, the issue affects Apache MINA versions 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6, making applications that utilize IoBuffer.getObject() susceptible to exploitation.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
>= 2.1.0, < 2.1.122.1.12 -
>= 2.2.0, < 2.2.72.2.7
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
As a temporary measure, users can avoid using the IoBuffer.getObject() method until they can upgrade to the patched versions. Additionally, implementing strict input validation and sanitization can help mitigate risks associated with deserialization vulnerabilities.
Conclusion
The Apache MINA vulnerability CVE-2026-42778 poses a significant risk due to the deserialization of untrusted data. It is essential for users to upgrade to the patched versions to mitigate potential security threats. Regular monitoring and updates are crucial for maintaining application security.
See every vulnerability recorded for org.apache.mina:mina-core →
FAQ
CVE-2026-42778 is a critical vulnerability in Apache MINA that allows deserialization of untrusted data due to an incomplete fix for a previous issue.
Apache MINA versions 2.1.0 to 2.1.11 and 2.2.0 to 2.2.6 are affected by this vulnerability.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By simply using your pom.xml file, Vulert can help identify if your application is affected by this vulnerability.
The CVSS score for this vulnerability is 9.8, indicating a critical level of risk.
To upgrade, modify your pom.xml file to include the updated version of mina-core, either 2.1.12 or 2.2.7, and then rebuild your project.
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