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TI-2026-56238 Aliases CVE-2026-81516GHSA-67c9-f6v2-qv86

Steeltoe.Discovery.Consul: malformed 'secure' metadata aborts service instance lookup (DoS)

Priority MEDIUM 40CWE-755Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00609 49th percentileScored 2026-11-07
Fix Fixed security-advisories (SteeltoeOSS): 4.3.0Steeltoe.Discovery.Consul (NuGet): 4.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SteeltoeOSSsecurity-advisories4.0.0 to before 4.3.04.3.0Patch availableCNA
—Steeltoe.Discovery.Consul (NuGet)4.0.0 to before 4.3.04.3.0Patch availableGHSA-67c9-f6v2-qv86
  • security-advisories VendorSteeltoeOSS Affected 4.0.0 to before 4.3.0 Fixed in 4.3.0 Patch available CNA
  • Steeltoe.Discovery.Consul (NuGet) Vendor— Affected 4.0.0 to before 4.3.0 Fixed in 4.3.0 Patch available GHSA-67c9-f6v2-qv86

Remediation

  • Fix · CNA security-advisories (SteeltoeOSS) Fixed in 4.3.0
  • Fix · GHSA-67c9-f6v2-qv86 Steeltoe.Discovery.Consul (NuGet) Fixed in 4.3.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-81516
  2. 2026-10-03 Alias added: GHSA-67c9-f6v2-qv86

References

Advisory 1

Other 4

  • TI-2024-27048 Basic Auth Credential Leakage to Logs After Fetch Registry Error in Steeltoe.Discovery.Eureka with Peer Awareness CVSS 3.1MEDIUM 5.3
  • TI-2026-36953 Steeltoe vulnerable to management-port isolation bypass via spoofed Host header CVSS 3.1HIGH 8.2
  • TI-2026-56237 Steeltoe.Discovery.Eureka: malformed enum/bool/timestamp field aborts entire registry fetch (DoS) CVSS 3.1HIGH 7.5
  • TI-2026-36955 Steeltoe.Discovery.Eureka: Unrecognized DataCenterInfo.Name poisons entire registry fetch CVSS 3.1HIGH 7.5
  • TI-2026-36959 Steeltoe's env sanitizer misses connection strings — leaks embedded DB passwords CVSS 3.1HIGH 7.5
  • TI-2026-56482 Steeltoe: Header-forwarded client cert lacks proof of private-key possession CVSS 3.1MEDIUM 6.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences