Improper Validation of Syntactic Correctness of Input Affecting steeltoe.discovery.eureka package, versions [,3.4.0)[4.0.0,4.2.0)
Threat Intelligence
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The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-STEELTOEDISCOVERYEUREKA-17423136
- published23 Jun 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE-2026-50196 (opens in a new tab)How to fix?
Upgrade Steeltoe.Discovery.Eureka to version 3.4.0, 4.2.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Syntactic Correctness of Input through the DataCenterInfo.FromJson parser in the appinfo component. An attacker can force the application to accept a crafted JSON JsonDataCenterInfo record with an unexpected Name value by supplying malicious instance metadata.
This lets the attacker inject an invalid or spoofed datacenter identity into instance registration and discovery, causing the consumer to misclassify the instance's source or reject it with a JSON parsing exception. In deployments that trust instance metadata from remote peers, this can break service registration and discovery flows for users relying on Eureka.