CVEvulnerability
CVE-2022-39254
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2022-09-29
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-287, CWE-322
Description
matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.
Affected configurations
• matrix-nio project matrix-nio (< 0.20)
Related
References
- https://github.com/poljar/matrix-nio/commit/b1cbf234a831daa160673defd596e6450e9c29f0 Patch, Third Party Advisory
- https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh Third Party Advisory
- https://github.com/poljar/matrix-nio/commit/b1cbf234a831daa160673defd596e6450e9c29f0 Patch, Third Party Advisory
- https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh Third Party Advisory