CVE-2026-81516
HighCVSS 7.5Summary
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.
Risk Assessment
A single malformed Consul registration can persistently prevent service discovery for all Steeltoe clients, causing an outage until the offending registration is removed. The risk affects availability across the service environment.
Recommendation
Upgrade Steeltoe to version 4.3.0, which fixes handling of invalid secure values in ConsulDiscoveryClient.
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-2026-81515High
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.
- 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, 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 the exception from one instance to abort construction of the entire instance list and make the targeted service undiscoverable. When GetAllInstancesAsync enumerates all services, one malformed instance can abort enumeration across every service. The outage persists until the offending registration is removed. This issue is fixed in version 4.3.0.