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...

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...

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...

RUSTSEC-2026-0159 Sender-binding gaps in to-device messages

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 colludes with ...