Apache MINA vulnerabilities

The fix for CVE-2026-47065/ZDRES-232 ("resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy"), released on 2026-06-02 and announced as "Fully addressed" in MINA 2.2.8, 2.1.13 and 2.0.29, was committed to the 2.2.X branch only. The 2.0.X and 2.1.X maintenance branches never received the resolveProxyClass() override, so the 2.0.29 and 2.1.13 artifacts listed as fixed -- and every later release on those lines, up to and including the current 2.0.30 and 2.1.14 -- remain vulnerable to the exact allow-list bypass that CVE-2026-47065 was meant to close.

Apache MINA versions 2.1.0 to 2.1.11 and 2.2.0 to 2.2.6 are vulnerable to arbitrary code execution due to a lack of class verification in the AbstractIoBuffer.resolveClass() method. The fix was introduced in versions 2.1.12 and 2.2.7.

The fix for CVE-2026-41409 was not applied to the 2.1.X and 2.2.X branches of Apache MINA. The issue concerns an incomplete fix for CVE-2024-52046, where the classname allowlist for deserialization was applied too late.

The CompressionFilter class in Apache MINA uses ZLib to deflate and inflate data, but does not control the resulting buffer size during decompression. Maliciously compressed data with a very high compression ratio can exhaust application memory. The fix introduces limits on the maximum decompressed size and compression ratio.

CVE-2023-35887 vulnerability in Apache MINA exposes sensitive information to unauthorized actors. Logged users on SFTP servers may discover 'exists/does not exist' information about items outside the rooted tree using parent navigation or symlinks.