CVE-2026-42778: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache MINA
CVE-2026-42778 is a critical deserialization vulnerability in Apache MINA versions 2. 1. 0 through 2. 1. 11 and 2. 2. 0 through 2. 2. 6. The issue arises because the classname allowlist intended to restrict deserialization is applied too late, after a static initializer in a class might have already executed, leading to unsafe deserialization of untrusted data.
AI Analysis
Technical Summary
This vulnerability is a deserialization of untrusted data issue (CWE-502) in Apache MINA's AbstractIoBuffer.getObject() method. The fix for a previous vulnerability (CVE-2024-52046) was incomplete because the classname allowlist was enforced too late, allowing potentially unsafe classes to be deserialized after their static initializers ran. Affected versions include Apache MINA 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6. The issue is resolved in versions 2.1.12 and 2.2.7 by applying the classname allowlist earlier in the deserialization process. The vulnerability has a CVSS 3.1 base score of 9.8, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability can lead to remote code execution or other severe impacts due to unsafe deserialization of untrusted data. The CVSS score of 9.8 reflects critical impact on confidentiality, integrity, and availability. Applications using vulnerable versions of Apache MINA that call IoBuffer.getObject() are at risk.
Mitigation Recommendations
A fix is available. The vulnerability is resolved in Apache MINA versions 2.1.12 and 2.2.7 by applying the classname allowlist earlier during deserialization. Users of affected versions are strongly advised to upgrade to these fixed versions. Patch status is confirmed by the vendor advisory embedded in the description. No alternative mitigations are indicated.
CVE-2026-42778: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache MINA
Description
CVE-2026-42778 is a critical deserialization vulnerability in Apache MINA versions 2. 1. 0 through 2. 1. 11 and 2. 2. 0 through 2. 2. 6. The issue arises because the classname allowlist intended to restrict deserialization is applied too late, after a static initializer in a class might have already executed, leading to unsafe deserialization of untrusted data.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a deserialization of untrusted data issue (CWE-502) in Apache MINA's AbstractIoBuffer.getObject() method. The fix for a previous vulnerability (CVE-2024-52046) was incomplete because the classname allowlist was enforced too late, allowing potentially unsafe classes to be deserialized after their static initializers ran. Affected versions include Apache MINA 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6. The issue is resolved in versions 2.1.12 and 2.2.7 by applying the classname allowlist earlier in the deserialization process. The vulnerability has a CVSS 3.1 base score of 9.8, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability can lead to remote code execution or other severe impacts due to unsafe deserialization of untrusted data. The CVSS score of 9.8 reflects critical impact on confidentiality, integrity, and availability. Applications using vulnerable versions of Apache MINA that call IoBuffer.getObject() are at risk.
Mitigation Recommendations
A fix is available. The vulnerability is resolved in Apache MINA versions 2.1.12 and 2.2.7 by applying the classname allowlist earlier during deserialization. Users of affected versions are strongly advised to upgrade to these fixed versions. Patch status is confirmed by the vendor advisory embedded in the description. No alternative mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-04-29T13:31:49.189Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f47ec1cbff5d8610ae12c2
Added to database: 5/1/2026, 10:21:53 AM
Last enriched: 5/1/2026, 10:36:29 AM
Last updated: 5/1/2026, 11:47:05 AM
Views: 8
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