---
id: CVE-2026-81515
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,
  EurekaDiscoveryClient deserializes the registry response as one unit, and an
  unrecognize…
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'
patched:
  - Steeltoe.Discovery.Eureka 4.3.0
published: '2026-09-17'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:22:19.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81515'
references:
  - url: >-
      https://github.com/SteeltoeOSS/Steeltoe/commit/bc1c3763aacc1fee82ef9932f338ec08dcb00432
    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-hr73-3gpv-hh6q
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81515'
  - url: 'https://github.com/advisories/GHSA-j8ph-6fxj-g533'
  - url: 'https://github.com/advisories/GHSA-hr73-3gpv-hh6q'
tags:
  - nvd
  - cve.org
  - ghsa
  - nuget
epss: 0.00609
epssPercentile: 0.46919
aliases:
  - GHSA-hr73-3gpv-hh6q
ecosystem: nuget
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T20:50:05.358608Z'
ingestedAt: '2026-09-17T16:21:47.710Z'
---

## 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, EurekaDiscoveryClient deserializes the registry response as one unit, and 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. The JsonInstanceInfoConverter, BoolStringJsonConverter, and LongStringJsonConverter parsing paths are affected. This issue is distinct from the earlier DataCenterInfo.name parsing vulnerability. This issue is fixed in version 4.3.0.

## Remediation

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

## Package advisory (CVE-2026-81515)

Affected packages:

- `Steeltoe.Discovery.Eureka >= 4.0.0, <= 4.2.0`

Patched in:

- `Steeltoe.Discovery.Eureka 4.3.0`

Source: https://github.com/advisories/GHSA-hr73-3gpv-hh6q