---
id: "CVE-2026-105626"
kind: "vulnerability"
aliases: ["CVE-2026-105626"]
title: "HashiCorp Consul: unauthenticated HTTP API flaw exhausts agent memory"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["consul", "infrastructure", "kubernetes", "self-hosted"]
not_affected_if: ["fixed-version"]
published_at: "2026-10-26T18:17:27+00:00"
first_seen_at: "2026-10-26T18:31:43+00:00"
updated_at: "2026-10-26T18:33:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105626", "first_seen_at": "2026-10-26T18:31:43+00:00"}]
---

# HashiCorp Consul: unauthenticated HTTP API flaw exhausts agent memory

HashiCorp Consul and Consul Enterprise have a denial-of-service flaw in the HTTP API. An unauthenticated attacker can exhaust memory on a Consul agent, crashing it or degrading service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `consul version` on each Consul agent and compare against the fixed versions listed in Fix.
- Confirm whether the HTTP API is reachable from untrusted networks, for example with `consul members` from outside the cluster network or by checking the bind address in the agent configuration.

## Fix

- Consul Community Edition: upgrade to `2.1.0`.
- Consul Enterprise: upgrade to `2.1.0` or `1.21.19`.

## Timeline

- 2026-10-26T18:31:43+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105626

## From the sources

HashiCorp Consul and Consul Enterprise are vulnerable to a denial of service in the HTTP API that may allow an unauthenticated attacker to exhaust memory on a Consul agent. This vulnerability (CVE-2026-105626) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_