CVE-2022-39254

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    CVE-2022-39254

    Published: 29 Sept 2022Last Modified: 27 Aug 2026

    Summary: When matrix-nio receives forwarded room keys, the receiver doesn't check if it requested the key from the forwarder

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39254.json, https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh, https://nvd.nist.gov/vuln/detail/CVE-2022-39254, https://github.com/poljar/matrix-nio/commit/b1cbf234a831daa160673defd596e6450e9c29f0

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f4f7b867ca20dd31521d5381efdab426669aa232

    Affected versions

    0.19.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2022-39254 | CVE-DB