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

Quick assessment

Affected
matrix-org matrix-rust-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The Matrix.org Foundation Matrix Rust SDK是The Matrix.org Foundation组织开源的一个基于Rust的Matrix客户端服务器开发工具包。 The Matrix.org Foundation Matrix Rust SDK 0.12.0版本至0.17.0之前版本存在授权问题漏洞，该漏洞源于解密包含 sender_device_keys 属性的 Olm 加密事件时缺少用户 ID 检查，可能导致攻击者与 homeserver 操作员串通伪造加密的设备

CVSS 6.9 · Medium EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
matrix-org matrix-rust-sdk >= 0.12.0, < 0.16.1 affected
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I. Basic Information for CVE-2026-45056

Vulnerability Information
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Vulnerability Title
Matrix Rust SDK: Sender-binding gaps in to-device and room-key attribution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
The Matrix.org Foundation Matrix Rust SDK 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Matrix.org Foundation Matrix Rust SDK是The Matrix.org Foundation组织开源的一个基于Rust的Matrix客户端服务器开发工具包。 The Matrix.org Foundation Matrix Rust SDK 0.12.0版本至0.17.0之前版本存在授权问题漏洞，该漏洞源于解密包含 sender_device_keys 属性的 Olm 加密事件时缺少用户 ID 检查，可能导致攻击者与 homeserver 操作员串通伪造加密的设备
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org matrix-rust-sdk >= 0.12.0, < 0.16.1 -

II. Public POCs for CVE-2026-45056

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III. Intelligence Information for CVE-2026-45056

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Patches & Fixes for CVE-2026-45056 (2)

Vendor Advisories for CVE-2026-45056 (2)

IV. Related Vulnerabilities

Same product: matrix-rust-sdk
Same vendor: matrix-org
Same weakness: CWE-290