---
title: "CVE-2026-105626: HashiCorp Consul - Denial of Service"
description: "HashiCorp Consul and Consul Enterprise < 2.1.0 contain a denial of service caused by memory exhaustion via the HTTP API, letting unauthenticated attackers exhaust memory on a Consul agent, exploit requires no authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-105626/
---

# CVE-2026-105626 HashiCorp Consul - Denial of Service

HashiCorp Consul and Consul Enterprise < 2.1.0 contain a denial of service caused by memory exhaustion via the HTTP API, letting unauthenticated attackers exhaust memory on a Consul agent, exploit requires no authentication.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105626)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

26 October 2026

Updated

27 October 2026

Weakness

[CWE-770](https://cwe.mitre.org/data/definitions/770.html)

## Vendor fix

Upgrade to Consul Community Edition 2.1.0, Consul Enterprise 2.1.0 or 1.21.19.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105626](https://nvd.nist.gov/vuln/detail/CVE-2026-105626)
- [https://discuss.hashicorp.com/t/hcsec-2026-48-consul-vulnerable-to-a-denial-of-service-in-http-apis/77913](https://discuss.hashicorp.com/t/hcsec-2026-48-consul-vulnerable-to-a-denial-of-service-in-http-apis/77913)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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