CVE-2026-42778 — Vulnerability in org.apache.mina:mina-core — CVE...

CRITICAL

Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41409 Incomplete Fix)

Published May 1, 2026Updated September 10, 2026Source: osv

Summary

The fix for CVE-2026-41409 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description: The fix for CVE-2024-52046 in Apache MINA AbstractIoBuffer.getObject() was incomplete. The classname allowlist of classes allowed to be deserialized was applied too late after a static initializer in a class to be read might already have been executed. 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.

Advisory Timeline

First published May 1, 2026 (164 days ago).
Last revised September 10, 2026 — 132 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven

Update org.apache.mina:mina-core to 2.2.7 or later

<!-- Update pom.xml dependency version to 2.2.7 for org.apache.mina:mina-core -->

Maven

Update org.apache.mina:mina-core to 2.1.12 or later

<!-- Update pom.xml dependency version to 2.1.12 for org.apache.mina:mina-core -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: maven (1).

Package	Ecosystem	Affected	Fixed In
org.apache.mina:mina-core	maven	2.2.0, 2.2.1, 2.2.2, 2.2.3 (+3 more)	2.2.7
org.apache.mina:mina-core	maven	2.1.0, 2.1.1, 2.1.10, 2.1.11 (+8 more)	2.1.12

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-502
Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://nvd.nist.gov/vuln/detail/CVE-2026-42778
ADVISORY
https://github.com/advisories/GHSA-76h9-2vwh-w278
ADVISORY
https://github.com/advisories/GHSA-f2wh-grmh-r6jm
ADVISORY
https://github.com/apache/mina
PACKAGE
https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
WEB

Frequently Asked Questions

What is CVE-2026-42778?: Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41409 Incomplete Fix) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-42778?: CVE-2026-42778 affects org.apache.mina:mina-core. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-42778 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-995c-6rp3-4m4x

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