CVE-2025-66622

Dec. 9, 2025, 6:36 p.m.

1.3
Low

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.

Product(s) Impacted

Vendor Product Versions
Matrix
  • Matrix-sdk-base
  • 0.14.1, <0.14.1, 0.16.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-755
Improper Handling of Exceptional Conditions
The product does not handle or incorrectly handles an exceptional condition.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a matrix matrix-sdk-base 0.14.1 / / / / / / /
a matrix matrix-sdk-base <0.14.1 / / / / / / /
a matrix matrix-sdk-base 0.16.0 / / / / / / /

References

https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0
https://github.com/matrix-org/matrix-rust-sdk/pull/5924
https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3
https://rustsec.org/advisories/RUSTSEC-2025-0135.html

Tags

security-advisories@github.com
CWE-755
2025-12-09
CVE-2025-66622

CVSS Score

1.3 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: PASSIVE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: LOW
  • Exploit Maturity: UNREPORTED

    • 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: Dec. 9, 2025, 4:18 p.m.
Last Modified: Dec. 9, 2025, 6:36 p.m.

Status : Awaiting Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

security-advisories@github.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.