CVE-2026-45056

matrix-sdk-crypto (Rust crate, part of the Matrix Rust SDK) versions from 0.12.0 up to the fix are vulnerable to sender spoofing in end-to-end encrypted to-device messages. The root cause is a missing validation of the sender's user ID when decrypting an Olm-encrypted event that contains the send...

Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution

Impact The matrix-sdk-crypto crate before 0.16.1 is missing a check for the sender's user ID when decrypting an Olm-encrypted to-device message containing the senderdevicekeys property. This could be exploited to spoof the sender of an encrypted to-device message, but only if the attacker collude...