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First version without a known vulnerability: 1.8.3
Slixmpp lacks SSL Certificate hostname validation in XMLStream
Fixed in: 1.8.3
SleekXMPP and Slixmpp Incorrect Implementation of Message Carbons
Fixed in: 1.2.4, 1.3.2, 22664ee7b86c8e010f312b66d12590fb47160ad8
slixmpp Incorrect Access Control
Fixed in: 1.4.2