Zip4j through 2.11.2, as used in Threema and other products, does not always check the MAC when decrypting a ZIP archive.
{ "binaries": [ { "binary_version": "2.2.8-1", "binary_name": "libzip4j-java" } ] }
{ "binaries": [ { "binary_version": "2.9.1-1", "binary_name": "libzip4j-java" } ] }
{ "binaries": [ { "binary_version": "2.11.5-1", "binary_name": "libzip4j-java" } ] }