Deserialization Flaw in Apache MINA IoBuffer Affects Multiple Versions
CVE-2026-42778

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Mina
Vendor
CVE Published:
1 May 2026

What is CVE-2026-42778?

A deserialization vulnerability exists in Apache MINA's IoBuffer.getObject() method, where the classname allowlist is applied too late, potentially allowing unauthorized class execution if accessed prematurely. This flaw impacts versions 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6, and has been resolved in Apache MINA version 2.1.12 and 2.2.7 through earlier application of necessary security checks. It is imperative for users of Apache MINA to upgrade their versions to safeguard against potential exploitation.

Affected Version(s)

Apache MINA 2.2.X <= 2.2.6

Apache MINA 2.1.X <= 2.1.11

References

https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3...
vendor-advisory

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Venkatraman Kumar, Securin
.