CVE-2026-55170: Github.com/openfga/openfga Remote Code Execution Vulnerability

LOW
Advisory Identifier: GHSA-cf98-j28v-49v6
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CVSS 5.4
CWE-178
Published
Advisory Summary

CVE-2026-55170 is a LOW (CVSS 5.4) remote code execution vulnerability (CWE-178: Improper Handling of Case Sensitivity) affecting Github.com/openfga/openfga libraries in the Go ecosystem. The issue involves openfga improper policy enforcement. Remediation is available by upgrading affected packages to version 1.18.0.

CVE-2026-55170 at a Glance

CVE Identifier CVE-2026-55170
GHSA Identifier GHSA-cf98-j28v-49v6
Severity LOW
CVSS v3.1 Base Score 5.4
CWE Classification CWE-178: Improper Handling of Case Sensitivity
Affected Product Github.com/openfga/openfga
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-55170

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: 1.18.0 
Upgrade github.com/openfga/openfga to 1.18.0
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-2026-55170, 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 1.18.0), 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-178: Improper Handling of Case Sensitivity, where the product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results. 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, when MySQL is being used as the datastore, two distinct check requests can return the same response. ## Preconditions This applies if the following preconditions are met: 1. You run OpenFGA with MySQL as the datastore 2. Your authorization decisions rely on case-sensitive user strings. ## Fix Upgrade to OpenFGA 1.18.0 or greater. ## Acknowledgements OpenFGA would like to thank @sahajamoth for the detailed report.

CVE-2026-55170 Affected Github.com/openfga/openfga Versions

1 component(s)
Fixed Versions:
1.18.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/openfga/openfga
golang/github.com/openfga/openfga
Go
< 1.18.0
1.18.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openfga/openfga/security/advisories/GHSA-cf98-j28v-49v6
NVD — CVE-2026-55170 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55170
Security Fix Commit FIX COMMIT
https://github.com/openfga/helm-charts/commit/96d5517a2693ff5def451dee7d6b9d1baeb281f8
Security Fix Commit FIX COMMIT
https://github.com/openfga/openfga/commit/a2e0dbefc3e01a95c785f81a3563bc6571b08b11
Github.com/openfga/openfga Release RELEASE
https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9
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/v1.18.0

Frequently Asked Questions

What is CVE-2026-55170?
CVE-2026-55170 is a security vulnerability in Github.com/openfga/openfga involving OpenFGA Improper Policy Enforcement under CWE-178: Improper Handling of Case Sensitivity.
Which Github.com/openfga/openfga versions are affected?
Affected versions include releases prior to 1.18.0 across affected packages: github.com/openfga/openfga.
What version fixes CVE-2026-55170?
Upgrading to 1.18.0 (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 1.18.0. Upgrade your dependency to 1.18.0 or later.
What is the CVSS score of CVE-2026-55170?
CVE-2026-55170 has a CVSS v3.1 base score of 5.4 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-55170?
CVE-2026-55170 is classified under CWE-178: Improper Handling of Case Sensitivity (The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.).
How can I check Go dependencies for CVE-2026-55170?
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-cf98-j28v-49v6",
  "modified" : "2026-07-21T13:59:39Z",
  "published" : "2026-06-18T15:05:30Z",
  "aliases" : [ "CVE-2026-55170" ],
  "summary" : "OpenFGA Improper Policy Enforcement",
  "details" : "## Description\n\nIn OpenFGA, when MySQL is being used as the datastore, two distinct check requests can return the same response.\n\n## Preconditions\n\nThis applies if the following preconditions are met:\n\n1. You run OpenFGA with MySQL as the datastore\n2. Your authorization decisions rely on case-sensitive user strings.\n\n## Fix\nUpgrade to OpenFGA 1.18.0 or greater.\n\n## Acknowledgements\nOpenFGA would like to thank @sahajamoth for the detailed report.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openfga/openfga"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.18.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/security/advisories/GHSA-cf98-j28v-49v6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55170"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/helm-charts/commit/96d5517a2693ff5def451dee7d6b9d1baeb281f8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/commit/a2e0dbefc3e01a95c785f81a3563bc6571b08b11"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openfga/openfga"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/releases/tag/v1.18.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-178" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-18T15:05:30Z",
    "nvd_published_at" : "2026-07-09T22:17:05Z"
  }
}