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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 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and 2.2.0 <= 2.2.5. The problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.

PUBLISHED Reserved 2026-04-21 | Published 2026-04-27 | Updated 2026-04-28 | Assigner apache




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-502 Deserialization of Untrusted Data

Product status

Default status
unaffected

2.2.0 (semver)
affected

2.1.0 (semver)
affected

2.0.0 (semver)
affected

Timeline

2026-04-17:Initial reporting

Credits

Venkatraman Kumar, Securin reporter

References

www.openwall.com/lists/oss-security/2026/04/27/4

lists.apache.org/thread/1l91w1mqsb3lwfd504fs045ylxntt2tm vendor-advisory

cve.org (CVE-2026-41635)

nvd.nist.gov (CVE-2026-41635)

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