PT-2026-46305 · Unknown · Matrix-Sdk-Crypto

Published 2026-06-03 · Updated 2026-06-04 · CVE-2026-45056

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions matrix-sdk-crypto versions prior to 0.16.1

Description The matrix-sdk-crypto crate fails to verify the sender's user ID during the decryption of Olm-encrypted to-device messages that include the sender device keys property. This flaw allows an attacker to spoof the sender of an encrypted to-device message, provided the attacker is the homeserver operator or is colluding with them.

Recommendations Update to version 0.16.1.

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-45056

GHSA-WFQ4-36M3-9G42

RUSTSEC-2026-0159

Affected Products

Matrix-Sdk-Crypto

References · 8

• https://osv.dev/vulnerability/RUSTSEC-2026-0159 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-wfq4-36m3-9g42 · Vendor Advisory
• https://github.com/matrix-org/matrix-rust-sdk/pull/6553 · Note
• https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42 · Note
• https://github.com/matrix-org/matrix-rust-sdk · Note
• https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1 · Note
• https://crates.io/crates/matrix-sdk-crypto · Note
• https://rustsec.org/advisories/RUSTSEC-2026-0159.html · Note