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CVE-2019-13132: a remote, unauthenticated client connecting to a libzmq application, running with a socket listening with CURVE encryption/authentication enabled, may cause a stack overflow and overwrite the stack with arbitrary data, due to a buffer overflow in the library. Users running public servers with the above configuration are highly encouraged to upgrade as soon as possible, as there are no known mitigations. All versions from 4.0.0 and upwards are affected.
Fix documentation to remove mention of features that are not available in 4.0.x.
Fix parsing application metadata when using CURVE.