#auth

## Overview OpenFGA is vulnerable to a DoS 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. ## Am I Affected? Yes, if your store contains an authorization model that allows circular relationships. For example, with this model: ``` model schema 1.1 type user type group relations define memberA: [user] or memberB or memberC or memberD or memberE define memberB: [user] or memberA or memberC or memberD or memberE define memberC: [user] or memberA or memberB or memberD or memberE define memberD: [user] or memberA or memberB or memberC or memberE define memberE: [user] or memberA or memberB or memberC or memberD ``` This Check: `(user:anne, memberA, group:X)` can exhaust memory in the server. ## Fix Upgrade to v1.3.2 and update any offending models. **[BREAKING]** If your model contained cycles or a relatio...

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