---
id: CVE-2026-81516
title: >-
  Steeltoe is an open source project that provides a collection of libraries
  that helps users build cloud-native applications
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
  registrat…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-755
vendor: SteeltoeOSS
product: security-advisories
affected:
  - 'security-advisories >= 4.0.0, < 4.3.0'
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:18:40.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81516'
references:
  - url: >-
      https://github.com/SteeltoeOSS/Steeltoe/commit/028569c4f4f0e9e393e3c22a4fa5d07987dd8673
    label: security-advisories@github.com
  - url: 'https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-67c9-f6v2-qv86
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T17:06:09.444746Z'
ingestedAt: '2026-09-17T16:21:47.711Z'
epss: 0.00609
epssPercentile: 0.46921
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.