CVE-2026-33729: Github.com/openfga/openfga OpenFGA Has An Authorization Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-h6c8-cww8-35hf
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CWE-1289 CWE-20 CWE-345
Published
Advisory Summary

CVE-2026-33729 is a MODERATE openfga has an authorization bypass vulnerability (CWE-1289: Improper Validation of Unsafe Equivalence in Input) affecting Github.com/openfga/openfga libraries in the Go ecosystem. The issue involves openfga has an authorization bypass through cached keys. Remediation is available by upgrading affected packages to version 1.13.1.

CVE-2026-33729 at a Glance

CVE Identifier CVE-2026-33729
GHSA Identifier GHSA-h6c8-cww8-35hf
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-1289: Improper Validation of Unsafe Equivalence in Input
Affected Product Github.com/openfga/openfga
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-33729

To remediate this vulnerability, upgrade all affected Github.com/openfga/openfga dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/openfga/openfga fixed: 1.13.1 
Upgrade github.com/openfga/openfga to 1.13.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/openfga/openfga

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-33729, inspect your project dependencies for Github.com/openfga/openfga:

inspect dependencies for github.com/openfga/openfga

Analyze the terminal output to locate any version of Github.com/openfga/openfga in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.13.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1289: Improper Validation of Unsafe Equivalence in Input, where the product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value. In Github.com/openfga/openfga, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Description In OpenFGA, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request. ### Am I Affected? Users are affected if the following preconditions are met: 1. The model has relations which rely on condition evaluation. 1. Caching is enabled. ### Fix Upgrade to OpenFGA v1.13.1. ### Acknowledgement OpenFGA would like to thank @Amemoyoi for the discovery and responsible disclosure.

CVE-2026-33729 Affected Github.com/openfga/openfga Versions

1 component(s)
Fixed Versions:
1.13.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/openfga/openfga
golang/github.com/openfga/openfga
Go
< 1.13.1
1.13.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openfga/openfga/security/advisories/GHSA-h6c8-cww8-35hf
NVD — CVE-2026-33729 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33729
Security Fix Commit FIX COMMIT
https://github.com/openfga/openfga/commit/049b50ccd2cc7e163bd897f3d17a7b859ad146f8
Github.com/openfga/openfga Source Repository REPOSITORY
https://github.com/openfga/openfga
Github.com/openfga/openfga Release RELEASE
https://github.com/openfga/openfga/releases/tag/v1.13.1

Frequently Asked Questions

What is CVE-2026-33729?
CVE-2026-33729 is a security vulnerability in Github.com/openfga/openfga involving OpenFGA has an Authorization Bypass through cached keys under CWE-1289: Improper Validation of Unsafe Equivalence in Input.
Which Github.com/openfga/openfga versions are affected?
Affected versions include releases prior to 1.13.1 across affected packages: github.com/openfga/openfga.
What version fixes CVE-2026-33729?
Upgrading to 1.13.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/openfga/openfga affected?
Yes, github.com/openfga/openfga is affected in releases prior to 1.13.1. Upgrade your dependency to 1.13.1 or later.
What CWE is associated with CVE-2026-33729?
CVE-2026-33729 is classified under CWE-1289: Improper Validation of Unsafe Equivalence in Input (The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.).
How can I check Go dependencies for CVE-2026-33729?
Run the dependency tree command: 'inspect dependencies for github.com/openfga/openfga'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-h6c8-cww8-35hf",
  "modified" : "2026-03-27T21:30:41Z",
  "published" : "2026-03-26T17:21:50Z",
  "aliases" : [ "CVE-2026-33729" ],
  "summary" : "OpenFGA has an Authorization Bypass through cached keys",
  "details" : "### Description\nIn OpenFGA, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request.\n\n### Am I Affected?\nUsers are affected if the following preconditions are met:\n1. The model has relations which rely on condition evaluation.\n1. Caching is enabled.\n\n### Fix\nUpgrade to OpenFGA v1.13.1.\n\n### Acknowledgement\nOpenFGA would like to thank @Amemoyoi for the discovery and responsible disclosure.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openfga/openfga"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/security/advisories/GHSA-h6c8-cww8-35hf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33729"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/commit/049b50ccd2cc7e163bd897f3d17a7b859ad146f8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openfga/openfga"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/releases/tag/v1.13.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1289", "CWE-20", "CWE-345" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T17:21:50Z",
    "nvd_published_at" : "2026-03-27T01:16:20Z"
  }
}