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 the `sender_device_keys` property. This could be exploited to forge an encrypted to-device event, but only if the attacker colludes with the homeserver operator. This issue is fixed in matrix-sdk-crypto 0.17.0. There are no known workarounds for the issue.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wfq4-36m3-9g42 Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 12 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Matrix-org
Matrix-org matrix-rust-sdk
Vendors & Products Matrix-org
Matrix-org matrix-rust-sdk

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
Description 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 the `sender_device_keys` property. This could be exploited to forge an encrypted to-device event, but only if the attacker colludes with the homeserver operator. This issue is fixed in matrix-sdk-crypto 0.17.0. There are no known workarounds for the issue.
Title Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution
Weaknesses CWE-290
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-14T18:17:31.910Z

Reserved: 2026-05-08T18:07:27.342Z

Link: CVE-2026-45056

cve-icon Vulnrichment

Updated: 2026-09-14T16:14:49.755Z

cve-icon NVD

Status : Received

Published: 2026-09-11T22:16:37.263

Modified: 2026-09-14T19:17:22.060

Link: CVE-2026-45056

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T19:45:07Z

Weaknesses