CVE-2022-39254 | BDVDB-2026-185671 Detail

Description#

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.

Impact#

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Exploit#

History#

1. Version 12022-09-29Record published in the CVE List.
2. Version 22025-04-23Most recent update recorded in the CVE List.