---
id: CVE-2026-87106
title: Consul vulnerable to a denial of service in the native RPC listener
summary: >-
  Consul and Consul Enterprise are vulnerable to a denial of service in the
  native RPC listener that may allow an authenticated client to exhaust server
  memory before ACL authorization is evaluated. A client that can complete the
  internal …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: HashiCorp
product: Consul
affected:
  - Consul >= 1.21.0 < 2.0.4
  - consul_enterprise >= 1.21.0 < 2.0.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T19:02:15.913180Z'
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T19:02:24.164Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-87106'
references:
  - url: >-
      https://discuss.hashicorp.com/t/hcsec-2026-35-consul-vulnerable-to-a-denial-of-service-in-the-native-rpc-listener/77737
tags:
  - cve.org
epss: 0.00411
epssPercentile: 0.32545
ingestedAt: '2026-09-11T16:45:48.025Z'
---

## Overview

Consul and Consul Enterprise are vulnerable to a denial of service in the native RPC listener that may allow an authenticated client to exhaust server memory before ACL authorization is evaluated. A client that can complete the internal RPC mTLS handshake may exploit this issue without holding a valid ACL token. This vulnerability (CVE-2026-87106) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.

## Affected

- `Consul >= 1.21.0 < 2.0.4`
- `consul_enterprise >= 1.21.0 < 2.0.4`

## Remediation

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