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CVE-2026-42779

Apache Mina insecure deserialization

9.8 CRITICALEPSS 0.76%
  1. Published1 May 2026

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.

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-2026-42779 being actively exploited?

CVE-2026-42779 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.76%.

How severe is CVE-2026-42779?

CVE-2026-42779 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.76% probability of exploitation.

Which products are affected by CVE-2026-42779?

Affected products include Apache Mina.

How do I fix CVE-2026-42779?

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

Secuno correlates vulnerabilities like CVE-2026-42779 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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