TI-2023-23371 Aliases CVE-2023-43645 GHSA-2hm9-h873-pgqh

Denial of service from circular relationship definitions in OpenFGA

LOW 28CWE-835Published 2023-09-26 · Updated 2024-09-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-835.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00937 61st percentileScored 2026-11-07

Fix Fixed openfga (openfga): 1.3.2github.com/openfga/openfga (Go): 1.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
openfga	openfga	before 1.3.2	1.3.2	Patch available	CNA
—	github.com/openfga/openfga (Go)	before 1.3.2	1.3.2	Patch available	GHSA-2hm9-h873-pgqh

openfga Vendoropenfga Affected before 1.3.2 Fixed in 1.3.2 Patch available CNA
github.com/openfga/openfga (Go) Vendor— Affected before 1.3.2 Fixed in 1.3.2 Patch available GHSA-2hm9-h873-pgqh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openfga:openfga::::::::	before 1.3.2	Vulnerable	openfga

cpe:2.3:a:openfga:openfga:*:*:*:*:*:*:*:* Versions before 1.3.2 Vulnerable ·openfga

Remediation

Fix · CNA openfga (openfga) Fixed in 1.3.2
Fix · GHSA-2hm9-h873-pgqh github.com/openfga/openfga (Go) Fixed in 1.3.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-43645
2026-10-03 Alias added: GHSA-2hm9-h873-pgqh

References

Patch 1

https://github.com/openfga/openfga/commit/725296025fd81227c89525808652c6acd4a605f6

Advisory 2

Other 1

https://github.com/openfga/openfga

TI-2023-17995 OpenFGA denial of service die to circular relationship CVSS 3.1HIGH 7.5
TI-2024-28441 OpenFGA Authorization Bypass CVSS 3.1CRITICAL 9.8
TI-2022-07597 OpenFGA Authorization Bypass CVSS 3.1CRITICAL 9.8
TI-2024-20816 OpenFGA Authorization Bypass CVSS 3.1CRITICAL 9.8
TI-2022-18717 OpenFGA Authorization Bypass CVSS 3.1CRITICAL 9.8
TI-2022-18716 OpenFGA Authorization Bypass CVSS 3.1CRITICAL 9.8

See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences