CVE-2022-39200

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    CVE-2022-39200

    Published: 12 Sept 2022Last Modified: 21 Oct 2026

    Summary: Signature checks not applied to some retrieved missing events

    Details: Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39200.json, https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c, https://nvd.nist.gov/vuln/detail/CVE-2022-39200, https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -47b2a5d6b8d2704950170cc636ed3dabdad59c06

    Affected versions

    v0.9.7
    v0.9.6
    v0.9.5
    v0.9.4
    v0.9.3
    v0.9.2
    v0.9.1
    v0.9.0

    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-2022-39200 | CVE-DB