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CVE-2026-45056 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/matrix-org/matrix-rust-sdk/pull/6553	[email protected]
https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1	[email protected]
https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42	[email protected]
https://rustsec.org/advisories/RUSTSEC-2026-0159.html	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-290	Authentication Bypass by Spoofing	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 14, 2026	CVE Modified	CISA-ADP
Sep 11, 2026	New CVE Received	[email protected]