A flaw was found in the implementation of transport.py in Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x before 2.2.3, 2.3.x before 2.3.2, and 2.4.x before 2.4.1 does not properly check whether authentication is completed before processing other requests, as demonstrated by channel-open. A customized SSH client can simply skip the authentication step.
Upstream Issue:
https://github.com/paramiko/paramiko/issues/1175
Upstream Patch:
https://github.com/paramiko/paramiko/commit/fa29bd8446c8eab237f5187d28787727b4610516
It was discovered that the RMI (Java Remote Method Invocation) server implementation in the JMX (Java Management Extensions) component of OpenJDK did not restrict which classes can be deserialized when deserializing authentication credentials. A remote unauthenticated attacker able to connect to a JMX port could possibly use this flaw trigger deserialization flaws.
apache. Multiple issues were addressed by updating to version 2.4.27.
Last updated 25 August 2025