CVE-2023-35933Network attack vector

Service interruption via unvalidated circular relationships

Published Jun 26, 2023 · Updated Dec 3, 2024

Denial of service in OpenFGA 1.1.0 and earlier allows remote attackers to interrupt authorization checks via circular models. Check and ListObjects constructed a type system without validating circular relationship definitions, allowing recursive evaluation to continue without a reachable exit. Unauthenticated API reachability and an affected model are required; triggering requests can exhaust service resources and interrupt authorization decisions.

CVSS severity5.9
Medium
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OpenFGA 1.1.0 and earlier allows remote attackers to interrupt authorization checks via circular models. Check and ListObjects constructed a type system without validating circular relationship definitions, allowing recursive evaluation to continue without a reachable exit. Unauthenticated API reachability and an affected model are required; triggering requests can exhaust service resources and interrupt authorization decisions.

The record

CVE
CVE-2023-35933
Published
Jun 26, 2023
Updated
Dec 3, 2024
Vendor
OpenFGA
Product
OpenFGA
Classifications
CWE-835, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenFGA · OpenFGAversion=< 1.1.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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