CVE-2026-50196 Steeltoe.Discovery.Eureka: Unrecognized DataCenterInfo.Name poisons entire registry fetch
An attacker can cause a permanent denial of service in Steeltoe Eureka clients by registering a service with an unsupported DataCenterInfo name, breaking registry updates.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50196?
CVE-2026-50196 is a high-severity denial of service vulnerability in SteeltoeOSS Steeltoe.Discovery.Eureka, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Discovery.Eureka prior to versions 4.2.0 and 3.4.0, `DataCenterInfo.FromJson` throws `ArgumentException` for any `name` value other than `"MyOwn"` or `"Amazon"`, despite the Java Eureka specification defining a third valid value: `"Netflix"`. The exception propagates through the entire registry deserialization chain and is swallowed by the periodic cache refresh task, leaving the local service registry permanently empty or stale. Versions 4.2.0 and 3.4.0 patch the issue. If an immediate upgrade is not possible, remove any registrations using unsupported `DataCenterInfo.name` values from the registry. In mixed Java/Spring and Steeltoe environments, audit for the `Netflix` data center type before deploying Steeltoe Eureka clients.
Which versions are affected by CVE-2026-50196?
4 open source packages ship an affected version, including Steeltoe.Discovery.Eureka.
| Package | Affected | Fixed in |
|---|---|---|
Steeltoe.Discovery.Eureka NuGet | All versions | 3.4.0 |
Steeltoe.Discovery.Eureka NuGet | All versions | 3.4.0 |
Steeltoe.Discovery.Eureka NuGet | From 4.0.0 | 4.2.0 |
Steeltoe.Discovery.Eureka NuGet | From 4.0.0 | 4.2.0 |
How do I fix CVE-2026-50196?
Upgrade Steeltoe.Discovery.Eureka to a fixed version for your release line: 3.4.0 or 4.2.0.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-50196 being exploited?
There is no known exploitation of CVE-2026-50196 in the wild and no public exploit code.
Sources
Also known as GHSA-j8ph-6fxj-g533.