Vulnerability in Matrix Matrix-rust-sdk
CVE-2025-66622
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 deni…
EPSS: 0.004 (29.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Matrix Matrix-rust-sdk
- Matrix-org Matrix-rust-sdk — versions < 0.16.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-66622?
- CVE-2025-66622 is a high-severity vulnerability in Matrix Matrix-rust-sdk, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2025-12-09.
- How severe is CVE-2025-66622?
- High severity. CVSS v3 base score is 7.5 out of 10.