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8 vulnerabilities by SteeltoeOSS
CVE-2026-50268 (GCVE-0-2026-50268)
Vulnerability from cvelistv5 – Published: 2026-06-17 22:01 – Updated: 2026-06-18 13:53
VLAI
Title
Steeltoe: OAEP setting silently selects PKCS#1 v1.5 padding
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Encryption 4.0.0 through 4.1.0, configuring `encrypt:rsa:algorithm=OAEP` does not enable OAEP encryption. Due to an incorrect BouncyCastle transformation string, the `OAEP` setting selects PKCS#1 v1.5, which is the same algorithm as the `DEFAULT` setting. Steeltoe.Configuration.Encryption version 4.2.0 patches the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/6c… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Configuration.Encryption |
Affected:
>= 4.0.0, < 4.2.0
|
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CVE-2026-50267 (GCVE-0-2026-50267)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:57 – Updated: 2026-06-18 19:11
VLAI
Title
Steeltoe: TLS private keys written to /tmp with default permissions, never deleted
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0, when MySQL or PostgreSQL service bindings from `VCAP_SERVICES` include TLS client credentials, the Connectors library writes those credentials to temporary files in `Path.GetTempPath()` using `File.CreateText`. On Linux, `File.CreateText` creates files with mode `0644` (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode `0400` in `/proc/<pid>/environ`. Steeltoe.Configuration.Abstractions version 4.2.0 patches the issue. If an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to `/tmp`.
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/8d… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Configuration.Abstractions |
Affected:
>= 4.0.0, < 4.2.0
|
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CVE-2026-50202 (GCVE-0-2026-50202)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:53 – Updated: 2026-06-18 13:08
VLAI
Title
Steeltoe's static JWKS cache shared across schemes and never invalidated
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Security.Authentication.CloudFoundryBase prior to version 3.4.0, Steeltoe.Security.Authentication.JwtBearer prior to version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect prior to version 4.2.0, the JWT signing key cache in `TokenKeyResolver` uses `kid` as the sole cache key without namespacing by authority. In applications with multiple `JwtBearer` schemes pointing to different identity providers, a key fetched for one scheme can satisfy token validation for another. Additionally, cached keys have no expiration, so rotated or revoked keys remain trusted until the application process restarts. Steeltoe.Security.Authentication.CloudFoundryBase version 3.4.0, Steeltoe.Security.Authentication.JwtBearer version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect version 4.2.0 patch the issue. If an immediate upgrade is not possible: In multi-scheme deployments, configure only one `JwtBearer` scheme per application when different identity providers are required; and/or restart the application process after an identity provider signing key rotation to clear stale cached keys.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-668 - Exposure of Resource to Wrong Sphere
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/04… | x_refsource_MISC |
| https://github.com/SteeltoeOSS/Steeltoe/commit/17… | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Security.Authentication.CloudFoundryBase |
Affected:
< 3.4.0
|
|
| SteeltoeOSS | Steeltoe.Security.Authentication.JwtBearer |
Affected:
< 4.2.0
|
|
| SteeltoeOSS | Steeltoe.Security.Authentication.OpenIdConnect |
Affected:
< 4.2.0
|
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CVE-2026-50201 (GCVE-0-2026-50201)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:46 – Updated: 2026-06-18 12:51
VLAI
Title
Steeltoe's sensitive actuators (heapdump/env) only require Restricted permission
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Management.Endpoint prior to version 4.2.0 and Steeltoe.Management.EndpointCore prior to version 3.4.0, all Steeltoe actuator endpoints default to `EndpointPermissions.Restricted`, which is mappeds to Cloud Foundry's `read_basic_data` permission (granted to Space Auditors and similar low-trust roles). Sensitive actuators including heap dump, environment, and thread dump do not raise this to `EndpointPermissions.Full`, so CF's `read_sensitive_data` permission flag is not enforced for those endpoints. Spring Boot's equivalent Cloud Foundry integration gates these endpoints with `read_sensitive_data` by default. Steeltoe.Management.Endpoint 4.2.0 and Steeltoe.Management.EndpointCore 3.4.0 patch the issue. If an immediate upgrade is not possible, explicitly set `RequiredPermissions = EndpointPermissions.Full` in the options for `HeapDumpEndpointOptions`, `EnvironmentEndpointOptions`, and `ThreadDumpEndpointOptions`; and/or if heap dump, thread dump, or environment are not needed in production, register only the required actuators individually instead of using `AddAllActuators()`.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/b3… | x_refsource_MISC |
| https://github.com/SteeltoeOSS/Steeltoe/commit/da… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Management.Endpoint |
Affected:
< 4.2.0
|
|
| SteeltoeOSS | Steeltoe.Management.EndpointBase |
Affected:
< 3.4.0
|
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CVE-2026-50200 (GCVE-0-2026-50200)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:44 – Updated: 2026-06-18 15:45
VLAI
Title
Steeltoe's env sanitizer misses connection strings — leaks embedded DB passwords
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Management.Endpoint prior to version 4.2.0 and Steeltoe.Management.EndpointCore prior to version 3.4.0, the `Sanitizer` component in the Environment actuator redacts configuration values by matching the configuration key name against a suffix list. The default list (`password`, `secret`, `key`, `token`, `.*credentials.*`, `vcap_services`) does not cover the standard .NET pattern `ConnectionStrings:<name>` or Steeltoe Connectors' `Steeltoe:Client:<type>:Default:ConnectionString`. There is no value-based scrubbing, so full connection string values including embedded `Password=` and `user:pass@host` segments are returned verbatim in `/actuator/env` responses. Steeltoe.Management.Endpoint 4.2.0 and Steeltoe.Management.EndpointCore 3.4.0 patch the issue. If an immediate upgrade is not possible: On the standard path, remove `env` from the actuator exposure list; add `.*connectionstring.*` to `KeysToSanitize` as a defense-in-depth measure for both paths; and/or require authorization on actuator endpoints.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/be… | x_refsource_MISC |
| https://github.com/SteeltoeOSS/Steeltoe/commit/e5… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Management.Endpoint |
Affected:
< 4.2.0
|
|
| SteeltoeOSS | Steeltoe.Management.EndpointCore |
Affected:
< 3.4.0
|
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CVE-2026-50196 (GCVE-0-2026-50196)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:18 – Updated: 2026-06-18 13:54
VLAI
Title
Steeltoe.Discovery.Eureka: Unrecognized DataCenterInfo.Name poisons entire registry fetch
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Discovery.Eureka prior to versions 4.2.0 and 3.4.0, `DataCenterInfo.FromJson` throws `ArgumentException` for any `name` value other than `"MyOwn"` or `"Amazon"`, despite the Java Eureka specification defining a third valid value: `"Netflix"`. The exception propagates through the entire registry deserialization chain and is swallowed by the periodic cache refresh task, leaving the local service registry permanently empty or stale. Versions 4.2.0 and 3.4.0 patch the issue. If an immediate upgrade is not possible, remove any registrations using unsupported `DataCenterInfo.name` values from the registry. In mixed Java/Spring and Steeltoe environments, audit for the `Netflix` data center type before deploying Steeltoe Eureka clients.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/b8… | x_refsource_MISC |
| https://github.com/SteeltoeOSS/Steeltoe/commit/c3… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Discovery.Eureka |
Affected:
>= 4.0.0, < 4.2.0
Affected: < 3.4.0 |
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CVE-2026-50194 (GCVE-0-2026-50194)
Vulnerability from cvelistv5 – Published: 2026-06-17 21:03 – Updated: 2026-06-18 19:12
VLAI
Title
Steeltoe vulnerable to management-port isolation bypass via spoofed Host header
Summary
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. When Steeltoe management endpoints versions 3.2.2 through 3.3.0 and 4.1.0 are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. Versions 3.4.0 and 4.2.0 patch the issue. If an immediate upgrade to a patched version is not possible, add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation and/or configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
| https://github.com/SteeltoeOSS/Steeltoe/commit/4c… | x_refsource_MISC |
| https://github.com/SteeltoeOSS/Steeltoe/commit/b7… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | Steeltoe.Management.Endpoint |
Affected:
< 4.2.0
|
|
| SteeltoeOSS | Steeltoe.Management.EndpointCore |
Affected:
>= 3.2.2, < 3.4.0
|
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CVE-2024-40636 (GCVE-0-2024-40636)
Vulnerability from cvelistv5 – Published: 2024-07-17 17:48 – Updated: 2024-08-02 04:33
VLAI
Title
Basic Auth Credential Leakage to Logs After Fetch Registry Error in Steeltoe.Discovery.Eureka with Peer Awareness
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-532 - Insertion of Sensitive Information into Log File
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/SteeltoeOSS/security-advisorie… | x_refsource_CONFIRM |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| SteeltoeOSS | security-advisories |
Affected:
< 3.2.8
|
|
| steeltoeoss | discovery |
Affected:
0 , < 3.2.8
(custom)
cpe:2.3:a:steeltoeoss:discovery:*:*:*:*:*:*:*:* |
{
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"product": "discovery",
"vendor": "steeltoeoss",
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"status": "affected",
"version": "0",
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],
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-40636",
"options": [
{
"Exploitation": "poc"
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{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
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"timestamp": "2024-07-17T18:34:42.919059Z",
"version": "2.0.3"
},
"type": "ssvc"
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"providerMetadata": {
"dateUpdated": "2024-07-17T18:39:10.256Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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{
"providerMetadata": {
"dateUpdated": "2024-08-02T04:33:11.743Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"references": [
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"name": "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-vmcp-66r5-3pcp",
"tags": [
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],
"url": "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-vmcp-66r5-3pcp"
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"title": "CVE Program Container"
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"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
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}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-532",
"description": "CWE-532: Insertion of Sensitive Information into Log File",
"lang": "en",
"type": "CWE"
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"providerMetadata": {
"dateUpdated": "2024-07-17T17:48:26.029Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"source": {
"advisory": "GHSA-vmcp-66r5-3pcp",
"discovery": "UNKNOWN"
},
"title": "Basic Auth Credential Leakage to Logs After Fetch Registry Error in Steeltoe.Discovery.Eureka with Peer Awareness"
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"dateReserved": "2024-07-08T16:13:15.511Z",
"dateUpdated": "2024-08-02T04:33:11.743Z",
"state": "PUBLISHED"
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