matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.
History

Tue, 09 Dec 2025 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 09 Dec 2025 10:15:00 +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

Tue, 09 Dec 2025 02:30:00 +0000

Type Values Removed Values Added
Description matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.
Title matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values
Weaknesses CWE-755
References
Metrics cvssV4_0

{'score': 1.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-12-09T02:07:18.831Z

Updated: 2025-12-09T16:02:47.455Z

Reserved: 2025-12-05T15:18:02.787Z

Link: CVE-2025-66622

cve-icon Vulnrichment

Updated: 2025-12-09T14:16:14.144Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-09T16:18:21.747

Modified: 2025-12-09T18:36:53.557

Link: CVE-2025-66622

cve-icon Redhat

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