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CVE-2026-42778

Apache Mina insecure deserialization

9.8 CRITICALEPSS 0.75%
  1. Published1 May 2026

Description

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 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 <= 2.1.110, 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

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Mina≥ 2.1.0 < 2.1.12 · ≥ 2.2.0 < 2.2.7

Remediation

Fixed in
Apache Mina≥ 2.1.12

References

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Frequently asked

Is CVE-2026-42778 being actively exploited?

CVE-2026-42778 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.75%.

How severe is CVE-2026-42778?

CVE-2026-42778 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.75% probability of exploitation.

Which products are affected by CVE-2026-42778?

Affected products include Apache Mina.

How do I fix CVE-2026-42778?

Upgrade affected software to a fixed version, for example Apache Mina 2.1.12 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.