CVE-2023-43645

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    CVE-2023-43645

    Published: 26 Sept 2023Last Modified: 12 Aug 2026

    Summary: Denial of service from circular relationship definitions in OpenFGA

    Details: OpenFGA is an authorization/permission engine built for developers and inspired by Google Zanzibar. OpenFGA is vulnerable to a denial of service attack when certain Check calls are executed against authorization models that contain circular relationship definitions. When the call is made, it's possible for the server to exhaust resources and die. Users are advised to upgrade to v1.3.2 and update any offending models. There are no known workarounds for this vulnerability. Note that for models which contained cycles or a relation definition that has the relation itself in its evaluation path, checks and queries that require evaluation will no longer be evaluated on v1.3.2+ and will return errors instead. Users who do not have cyclic models are unaffected.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43645.json, https://github.com/openfga/openfga/security/advisories/GHSA-2hm9-h873-pgqh, https://nvd.nist.gov/vuln/detail/CVE-2023-43645, https://github.com/openfga/openfga/commit/725296025fd81227c89525808652c6acd4a605f6

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -725296025fd81227c89525808652c6acd4a605f6

    Affected versions

    v1.3.1
    v1.3.0

    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-2023-43645 | CVE-DB