Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Mina | >= 2.0.0, < 2.0.28 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/1l91w1mqsb3lwfd504fs045ylxntt2tmMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/27/4Mailing ListThird Party Advisory
FAQ
What is CVE-2026-41635?
CVE-2026-41635 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2026-41635?
CVE-2026-41635 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-41635?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Mina.