CVE-2026-81515
HighCVSS 7.5Summary
Steeltoe in versions from 4.0.0 until 4.3.0, in EurekaDiscoveryClient, deserializes the registry response as one unit, so an unrecognized actionType or status, a non-Boolean isCoordinatingDiscoveryServer, or a nonnumeric timestamp can abort the entire response. A principal that can register or update an instance can cause all connected Steeltoe clients to receive an empty or stale instance list until the malformed registration is removed.
Risk Assessment
An attacker able to register an instance in Eureka can cause service discovery failure for all Steeltoe clients, resulting in service unavailability until the malformed registration is removed. The risk affects continuity of cloud-native applications.
Recommendation
Upgrade Steeltoe to version 4.3.0, which fixes the JsonInstanceInfoConverter, BoolStringJsonConverter, and LongStringJsonConverter parsing paths.
Other vulnerabilities in Steeltoe
See all- CVE-2026-81868Medium
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. Prior to 4.3.0, Steeltoe.Security.Authorization.Certificate deployments using AddOrgAndSpacePolicies() and UseCertificateAuthorization() trust the public certificate supplied in the X-Client-Cert request header without proving possession of the corresponding private key. Common Cloud Foundry routers do not remove this header from inbound requests. When inbound requests are not restricted to a known trusted proxy source IP, an attacker who obtains the public certificate of an application instance in the target organization or space and can reach the application can spoof X-Client-Cert to bypass the SameOrg and SameSpace policies for the certificate validity period. This issue is fixed in version 4.3.0.
- CVE-2026-81516High
Steeltoe in versions from 4.0.0 until 4.3.0, in ConsulDiscoveryClient, constructs ConsulServiceInstance objects by parsing each registration's secure metadata with a strict Boolean conversion. A principal that can register a Consul service can supply a secure value other than true or false, causing an exception that aborts construction of the entire instance list and makes the targeted service undiscoverable; when GetAllInstancesAsync enumerates all services, one malformed instance can abort enumeration across every service.
- CVE-2026-75523Medium
In Steeltoe before version 4.3.0, the /actuator/httpexchanges endpoint masks only URI user information but does not inspect query strings. When IncludeQueryString is enabled, the response can disclose OAuth tokens, password-reset tokens, signed-URL signatures, API keys, and other query-string secrets from prior traffic. The endpoint's DEBUG logger also records these URIs, creating a second disclosure channel.
Original NVD description (English source)
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. From 4.0.0 until 4.3.0, EurekaDiscoveryClient deserializes the registry response as one unit, and an unrecognized actionType or status, a non-Boolean isCoordinatingDiscoveryServer, or a nonnumeric timestamp can abort the entire response. A principal that can register or update an instance can cause all connected Steeltoe clients to receive an empty or stale instance list until the malformed registration is removed. The JsonInstanceInfoConverter, BoolStringJsonConverter, and LongStringJsonConverter parsing paths are affected. This issue is distinct from the earlier DataCenterInfo.name parsing vulnerability. This issue is fixed in version 4.3.0.