CVE DATABASE / CVE-2026-42779

CVE-2026-42779

CVSS 9.8 · CRITICAL

Summary

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.

CVSS 3.1 breakdown

Base score	9.8 (CRITICAL)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector	NETWORK
Attack complexity	LOW
Privileges required	NONE
User interaction	NONE
Scope	UNCHANGED
Confidentiality	HIGH
Integrity	HIGH
Availability	HIGH

Weakness type (CWE)

CWE-502

Affected products

Apache mina

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Our coverage

Apache MINA CVE-2026-42778 and CVE-2026-42779: Dual CVSS 9.8 RCE Patched

References

https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0

Data: NIST NVD. NVD last modified 2026-05-01. Always verify against the vendor advisory before acting.