Vulnerability-Lookup

CVE-2026-81516 (GCVE-0-2026-81516)

Vulnerability from cvelistv5 – Published: 2026-09-17 15:38 – Updated: 2026-09-17 19:19

Title

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

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 17:06 UTC

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/SteeltoeOSS/security-advisorie…	x_refsource_CONFIRM
https://github.com/SteeltoeOSS/Steeltoe/commit/02…	x_refsource_MISC
https://github.com/SteeltoeOSS/Steeltoe/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
SteeltoeOSS	security-advisories	Affected: >= 4.0.0, < 4.3.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-81516

Vulnerability from fkie_nvd - Published: 2026-09-17 16:17 - Updated: 2026-09-17 20:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/SteeltoeOSS/Steeltoe/commit/028569c4f4f0e9e393e3c22a4fa5d07987dd8673
	security-advisories@github.com	https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0
	security-advisories@github.com	https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-67c9-f6v2-qv86

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "security-advisories",
          "vendor": "SteeltoeOSS",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.3.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    {
      "lang": "en",
      "value": "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-81516",
  "lastModified": "2026-09-17T20:18:40.493",
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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GHSA-67C9-F6V2-QV86

Vulnerability from github – Published: 2026-09-17 20:30 – Updated: 2026-09-17 20:30

Summary

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

Details

Summary

Steeltoe's Consul discovery client parses the secure metadata field on each registered service instance using bool.Parse, which throws on any value other than true or false. A single service instance registered with a malformed secure value (for example yes or 1) aborts construction of the entire instance list for that service, making the service undiscoverable. When GetAllInstancesAsync is used, one malformed instance in any service can abort enumeration across all services. This is the same "one malformed field aborts the whole batch" availability class as CVE-2026-50196, but affecting the Consul discovery client.

Impact

Any principal that can register a service in the Consul catalog can trigger a service-discovery outage for all Steeltoe applications resolving that service. The outage affects all instances of the targeted service — not just the malformed one — and persists until the offending registration is removed.

Affected configuration

Application uses ConsulDiscoveryClient (any deployment).
The Consul catalog contains at least one service instance with a secure metadata value that is not true or false.
Mixed-platform environments where non-.NET clients register services with non-standard metadata values are more likely to encounter this condition.

Mitigations

If an immediate upgrade is not possible:

Audit the Consul catalog for service registrations with non-standard secure metadata values.
Restrict write access to the Consul service registration API to trusted services.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.0"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Steeltoe.Discovery.Consul"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-81516"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T20:30:54Z",
    "nvd_published_at": "2026-09-17T16:17:46Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nSteeltoe\u0027s Consul discovery client parses the `secure` metadata field on each registered service instance using `bool.Parse`, which throws on any value other than `true` or `false`. A single service instance registered with a malformed `secure` value (for example `yes` or `1`) aborts construction of the entire instance list for that service, making the service undiscoverable. When `GetAllInstancesAsync` is used, one malformed instance in any service can abort enumeration across all services.\nThis is the same \"one malformed field aborts the whole batch\" availability class as [CVE-2026-50196](https://github.com/advisories/GHSA-j8ph-6fxj-g533), but affecting the Consul discovery client.\n\n## Impact\n\nAny principal that can register a service in the Consul catalog can trigger a service-discovery outage for all Steeltoe applications resolving that service. The outage affects all instances of the targeted service \u2014 not just the malformed one \u2014 and persists until the offending registration is removed.\n\n## Affected configuration\n\n- Application uses `ConsulDiscoveryClient` (any deployment).\n- The Consul catalog contains at least one service instance with a `secure` metadata value that is not `true` or `false`.\n- Mixed-platform environments where non-.NET clients register services with non-standard metadata values are more likely to encounter this condition.\n\n## Mitigations\n\nIf an immediate upgrade is not possible:\n\n- Audit the Consul catalog for service registrations with non-standard `secure` metadata values.\n- Restrict write access to the Consul service registration API to trusted services.",
  "id": "GHSA-67c9-f6v2-qv86",
  "modified": "2026-09-17T20:30:54Z",
  "published": "2026-09-17T20:30:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-67c9-f6v2-qv86"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81516"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/Steeltoe/commit/028569c4f4f0e9e393e3c22a4fa5d07987dd8673"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SteeltoeOSS/security-advisories"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Steeltoe.Discovery.Consul: malformed \u0027secure\u0027 metadata aborts service instance lookup (DoS)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-81516 (GCVE-0-2026-81516)

FKIE_CVE-2026-81516

GHSA-67C9-F6V2-QV86

Summary

Impact

Affected configuration

Mitigations

Tags

Sightings

Nomenclature

Related by attack behaviour