Denial-of-Service Vulnerability in Matrix SDK Base Component
CVE-2025-66622

1.3LOW

Key Information:

Vendor

Matrix-org

Status
Matrix-rust-sdk
Vendor
CVE Published:
9 December 2025

What is CVE-2025-66622?

The matrix-sdk-base component, which serves as a foundation to build Matrix client libraries, has a vulnerability present in versions up to 0.14.1. This flaw arises from a serialization issue that mismanages responses with custom m.room.join_rules, enabling exploitation for denial-of-service conditions. Specifically, when a user is invited to a room containing non-standard join rules, the synchronization process stutters, leading to a stall that obstructs processing across all rooms. This issue has been rectified in version 0.16.0, ensuring that the library can correctly manage custom join rules and maintain operational integrity.

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Deploy the Patch

Affected Version(s)

matrix-rust-sdk < 0.16.0

References

https://github.com/matrix-org/matrix-rust-sdk/security/ad...
x_refsource_CONFIRM
https://github.com/matrix-org/matrix-rust-sdk/pull/5924
x_refsource_MISC
https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0...
x_refsource_MISC

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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