# CVE-2026-50196: Steeltoe.Discovery.Eureka Denial of Service via Registry Poisoning

Source: https://junglewise.ai/threats/cve-2026-50196-steeltoe-discovery-eureka-denial-of-service-via-registry  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-07-02  
License: CC BY 4.0 with a link back

CVE-2026-50196 · Severity: high · CVSS 7.5 · Published 2026-06-17

A vulnerability in the Steeltoe Eureka client can cause a complete failure of service discovery within a cloud-native application environment. If any service in the network registers with a data center name that the client does not recognize (such as 'Netflix'), the client's local registry becomes corrupted and stops updating. This results in an application being unable to find or communicate with other services, leading to potential service outages and operational downtime.

Technologies: [Steeltoe.Discovery.Eureka (NuGet)](https://junglewise.ai/threats/technologies/nuget-steeltoe-discovery-eureka). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget), [SteeltoeOSS](https://junglewise.ai/threats/vendors/steeltoeoss).

## Quick answers

**Is CVE-2026-50196 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50196 being exploited in the wild.

**How severe is CVE-2026-50196?** High severity, with a CVSS score of 7.5, published 17 June 2026.

**Which products and versions are affected?** Steeltoe.Discovery.Eureka (NuGet) ECOSYSTEM:introduced=4.0.0,fixed=4.2.0; SteeltoeOSS Discovery.Eureka >= 4.0.0, <= 4.1.0; <= 3.3.0; SteeltoeOSS Steeltoe.Discovery.Eureka >= 4.0.0, < 4.2.0; < 3.4.0.

**Is there a fix for CVE-2026-50196?** Yes. Steeltoe.Discovery.Eureka (NuGet): upgrade to 4.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-50196 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-50196?** Check whether you run Steeltoe.Discovery.Eureka (NuGet), SteeltoeOSS Discovery.Eureka or SteeltoeOSS Steeltoe.Discovery.Eureka at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Steeltoe.Discovery.Eureka (NuGet): upgrade to 4.2.0 or later

  ```sh
  dotnet add package Steeltoe.Discovery.Eureka --version 4.2.0
  ```


## Technical details

The Steeltoe Eureka client's DataCenterInfo.FromJson method incorrectly validates the 'name' field, throwing an ArgumentException for any value other than 'MyOwn' or 'Amazon'. This occurs even for valid specification values like 'Netflix'. Because this exception is swallowed by the periodic cache refresh task during deserialization, the local service registry fails to update and remains in a stale or empty state. An attacker or an incompatible legitimate service can trigger this denial-of-service condition by registering a service with an unsupported data center name. The issue is fixed in versions 3.4.0 and 4.2.0.

## Affected products

- SteeltoeOSS Steeltoe.Discovery.Eureka >= 4.0.0, <= 4.1.0; <= 3.3.0

## Identifiers

- CVE-2026-50196
- GHSA-j8ph-6fxj-g533

## Timeline

- 2026-05-29: disclosed
- 2026-06-17: advisory: NVD published date
- 2026-07-02: patched: GitHub Advisory reviewed and updated

## References

- [https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-j8ph-6fxj-g533](https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-j8ph-6fxj-g533)
- [https://github.com/SteeltoeOSS/Steeltoe/commit/b8ed8557bb595863e4f340051d16b26ba40a75f4](https://github.com/SteeltoeOSS/Steeltoe/commit/b8ed8557bb595863e4f340051d16b26ba40a75f4)
- [https://github.com/SteeltoeOSS/Steeltoe/commit/c34a7399e808d0d11dd977460e81df1f2722df28](https://github.com/SteeltoeOSS/Steeltoe/commit/c34a7399e808d0d11dd977460e81df1f2722df28)
- [https://api.github.com/repos/SteeltoeOSS/security-advisories/security-advisories/GHSA-j8ph-6fxj-g533](https://api.github.com/repos/SteeltoeOSS/security-advisories/security-advisories/GHSA-j8ph-6fxj-g533)

## Related threats

- [Steeltoe Eureka Discovery Client denial of service via malformed registry fields](https://junglewise.ai/threats/cve-2026-81515-steeltoe-eureka-discovery-client-denial-of-service-via-malformed)
- [Steeltoe Leaks Basic Auth Credentials to Logs After Fetch Registry Error](https://junglewise.ai/threats/cve-2024-40636-steeltoe-leaks-basic-auth-credentials-to-logs-after-fetch)