CVE-2026-45056 Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution

matrix-sdk-crypto is a no-network-IO implementation of a state machine that handles end-to-end encryption for Matrix clients. Starting in version 0.12.0 and prior to version 0.17.0, the matrix-sdk-crypto crate was missing a check for the user ID when decrypting an Olm-encrypted event containing t...

GHSA-WFQ4-36M3-9G42 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...