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CVE-2026-42779— Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)

Quick assessment

Affected
Apache Software Foundation Apache MINA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache MINA是美国阿帕奇（Apache）基金会的一款网络应用程序框架。该产品主要用于开发高性能和高可伸缩性的网络应用程序。 Apache MINA 2.1.0版本至2.1.11及之前版本和2.2.0版本至2.2.6及之前版本存在代码问题漏洞，该漏洞源于AbstractIoBuffer.resolveClass中一个分支未检查类名，绕过类名允许列表，可能导致执行任意代码。

CVSS 9.8 · Critical EPSS 0.76% · P54

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache MINA 2.2.X≤ 2.2.6 affected
2.1.X≤ 2.1.11 affected
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I. Basic Information for CVE-2026-42779

Vulnerability Information
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Vulnerability Title
Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)
Source: CVE Program / CVE List V5
Vulnerability Description
The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description: Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed. The fix checks if the class is present in the accepted class filter before calling Class.forName(). Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6. The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Apache MINA 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache MINA是美国阿帕奇（Apache）基金会的一款网络应用程序框架。该产品主要用于开发高性能和高可伸缩性的网络应用程序。 Apache MINA 2.1.0版本至2.1.11及之前版本和2.2.0版本至2.2.6及之前版本存在代码问题漏洞，该漏洞源于AbstractIoBuffer.resolveClass中一个分支未检查类名，绕过类名允许列表，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache MINA 2.2.X ~ 2.2.6 -

II. Public POCs for CVE-2026-42779

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III. Intelligence Information for CVE-2026-42779

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Mailing List Discussions for CVE-2026-42779 (1)

Same Patch Batch · Apache Software Foundation · 2026-05-01 · 5 CVEs total

CVE-2026-42778 9.8 CRITICAL Apache MINA: CWE-502 Deserialization of Untrusted Data (take 2)
CVE-2026-42402 7.5 HIGH Apache Neethi: Policy Normalization Unbounded Resource Allocation DoS
CVE-2026-42403 7.5 HIGH Apache Neethi: Circular Policy Reference Infinite Loop
CVE-2026-42404 6.5 MEDIUM Apache Neethi: Unrestricted HTTP Redirect Following in Policy References

IV. Related Vulnerabilities

Same product: Apache MINA
Same vendor: Apache Software Foundation
Same weakness: CWE-502

V. Comments for CVE-2026-42779

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