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EUVD-2026-6335

2026-10-06T19:11:25.962315+00:00

EUVD-2026-6335

fkie_cve-2024-40636

2026-10-06T19:11:25.962360+00:00

Steeltoe is an open source project that provides a collection of libraries that helps users build production-grade cloud-native applications using externalized configuration, service discovery, distributed tracing, application management, and more. When utilizing multiple Eureka server service URLs with basic auth and encountering an issue with fetching the service registry, an error is logged with the Eureka server service URLs but only the first URL is masked. The code in question is `_logger.LogError(e, "FetchRegistry Failed for Eureka service urls: {EurekaServerServiceUrls}", new Uri(ClientConfig.EurekaServerServiceUrls).ToMaskedString());` in the `DiscoveryClient.cs` file which may leak credentials into logs. This issue has been addressed in version 3.2.8 of the Steeltoe.Discovery.Eureka nuget package.

GHSA-vmcp-66r5-3pcp — Steeltoe Leaks Basic Auth Credentials to Logs After Fetch Registry Error

2026-10-06T19:11:25.962402+00:00

Affected: NuGet: Steeltoe.Discovery.Eureka, NuGet: Steeltoe.Discovery.EurekaBase, NuGet: Steeltoe.Discovery.ClientCore, NuGet: Steeltoe.Discovery.ClientAutofac

### Summary When utilizing multiple Eureka server service URLs with basic auth and encountering an issue with fetching the service registry, an error is logged with the Eureka server service URLs but only the first URL is masked.

### Details Package: Steeltoe.Discovery.Eureka Package version: 3.2.1 Branch: "release/3.2" File name: `DiscoveryClient.cs` Line number: 325 Code in question: `_logger.LogError(e, "FetchRegistry Failed for Eureka service urls: {EurekaServerServiceUrls}", new Uri(ClientConfig.EurekaServerServiceUrls).ToMaskedString());`

Error message in logs: `FetchRegistry Failed for Eureka service urls: https://****:****@eureka1.com:443/eureka,https://user:password@eureka2.com:443/eureka`

I thought `new Uri(clientOptions.EurekaServerServiceUrls)` would throw a `UriFormatException` since there are multiple URLs but my logs are showing two URLs regardless.

### PoC 1. Set Eureka config with multiple server URLs with basic auth 2. Apologies for not being more descriptive for this step, but I believe we would just need to trigger an exception in `FetchFullRegistryAsync`. 3. Check the logs and should see the error

### Impact Vulnerability: Credential leakage in the logs Who does it impact?: Users who are using peer awareness with Spring Eureka