CVE-2026-55170 — openfga
Fix: openfga/helm-charts@96d5517CVE-2026-55170 is a CWE-178 vulnerability in github.com/openfga/openfga. A fix is available for github.com/openfga/openfga — see the affected versions and patch details below.
OpenFGA MySQL backend: case-insensitive collation on identifier columns causes incorrect authorization decisions
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-55170.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
Real-World Exposure
github.com/openfga/openfgaReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
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:
- You run OpenFGA with MySQL as the datastore
- 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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/openfga/openfga | all versions | 1.18.0go get github.com/openfga/openfga@v1.18.0 |
Affected Products
helm chartsopenfgaopenfgaopenfgaDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/openfga/openfga, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/openfga/openfga to 1.18.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-55170 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This flaw affects OpenFGA when MySQL is used as the datastore backend and authorization decisions rely on case-sensitive user identifiers. Red Hat does not ship OpenFGA as a standalone product. The affected code is bundled inside Grafana's experimental "Zanzana" authorization engine (which vendors…
No mitigation is required for the affected Red Hat products, since none of them expose Grafana's Zanzana/OpenFGA authorization engine as a supported, user-facing feature backed by MySQL. Operators running a standalone, self-configured OpenFGA deployment with MySQL as the datastore should upgrade to OpenFGA 1.18.0 or later, which changes the MySQL identifier columns to a case-sensitive (utf8mb4_bin) collation.Source: Red Hat security advisory for CVE-2026-55170 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-55170 in your dependencies?
Find it across Go, including transitive dependencies.