CVE-2026-42779criticalCWE-502

CVE-2026-42779: critical vulnerability in Apache MINA

Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)

Published · Updated

Follow this CVE+ Monitor Apache MINA+ Monitor org.apache.mina:mina-core

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 1.2%
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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache MINA
Related CVEs — Apache MINA

In the same product, most dangerous first.

CVE-2024-52046CRITICALApache MINA: MINA applications using unbounded deserialization may allow RCEEPSS 24.4%CVE-2021-41973—Apache MINA HTTP listener DOSEPSS 4.6%CVE-2019-0231—Apache MINA SSLFilter security IssueEPSS 2.1%CVE-2026-42778CRITICALApache MINA: CWE-502 Deserialization of Untrusted Data (take 2)EPSS 0.7%CVE-2026-41635CRITICALApache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCEEPSS 0.6%CVE-2026-118636CRITICALApache MINA: Unsafe Deserialization (CWE-502) in JavaNativeMessageDecoderEPSS 0.6%