CVE-2024-40636 is a low-severity security vulnerability in Steeltoe.Discovery.Eureka (nuget), affecting versions <= 3.2.7. It is fixed in 3.2.8.
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:[email protected]: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 Set Eureka config with multiple server URLs with basic auth Apologies for not being more descriptive for this step, but I believe we would just need to trigger an exception in FetchFullRegistryAsync. 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
CVE-2024-40636 has a CVSS score of 2.5 (Low). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (3.2.8). Upgrading removes the vulnerable code path.
nuget
Steeltoe.Discovery.Eureka (<= 3.2.7)Steeltoe.Discovery.EurekaBase (<= 2.5.5)Steeltoe.Discovery.ClientCore (< 3.0.0)Steeltoe.Discovery.ClientAutofac (<= 2.5.5)Steeltoe.Discovery.Eureka → 3.2.8 (nuget)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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Already deployed Kodem? See CVE-2024-40636 in your environment →Upgrade Steeltoe.Discovery.Eureka to 3.2.8 or later to resolve this vulnerability.
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CVE-2024-40636 is a low-severity security vulnerability in Steeltoe.Discovery.Eureka (nuget), affecting versions <= 3.2.7. It is fixed in 3.2.8.
CVE-2024-40636 has a CVSS score of 2.5 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Steeltoe.Discovery.Eureka (nuget) (versions <= 3.2.7)Steeltoe.Discovery.EurekaBase (nuget) (versions <= 2.5.5)Steeltoe.Discovery.ClientCore (nuget) (versions < 3.0.0)Steeltoe.Discovery.ClientAutofac (nuget) (versions <= 2.5.5)Yes. CVE-2024-40636 is fixed in 3.2.8. Upgrade to this version or later.
Whether CVE-2024-40636 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade Steeltoe.Discovery.Eureka to 3.2.8 or later.