Updated olm packages fix security vulnerability:
The olm_session_describe function in Matrix libolm before 3.2.7 is
vulnerable to a buffer overflow. The Olm session object represents a
cryptographic channel between two parties. Therefore, its state is
partially controllable by the remote party of the channel. Attackerscan construct a crafted sequence of messages to manipulate the state
of the receiver's session in such a way that, for some buffer sizes,
a buffer overflow happens on a call to olm_session_describe.
Furthermore, safe buffer sizes were undocumented. The overflow content
is partially controllable by the attacker and limited to ASCII spaces
and digits (CVE-2021-44538).