CVE-2026-105608: Consul vulnerable to an authorization bypass in service mesh registration

Q: Who can exploit this authorization bypass?

A user who has service write permission can exploit it. The bypass allows that user to apply Envoy escape-hatch configuration without also having the required mesh write permission.

Q: Which releases contain fixes?

The issue is fixed in Consul Community Edition 2.1.0, and in Consul Enterprise 2.1.0 and 1.21.19.

Published Oct 26, 2026

Updated

HashiCorp Consul and Consul Enterprise are vulnerable to an authorization bypass in service mesh proxy registration. This may allow a user with service write permission to apply Envoy escape-hatch configuration without the required mesh write permission. This vulnerability (CVE-2026-105608) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.

Affected Software

2 affected components

HashiCorp Consul Community Edition<2.1.0

HashiCorp Consul Enterprise<1.21.19, <2.1.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade HashiCorp Consul Community Edition to a version that resolves this vulnerability.
Fixed in 2.1.0
Upgrade
Upgrade HashiCorp Consul Enterprise to a version that resolves this vulnerability.
Fixed in 2.1.0
Upgrade
Upgrade HashiCorp Consul Enterprise to a version that resolves this vulnerability.
Fixed in 1.21.19

Event History

Oct 26, 2026

CVE Published

via MITRE·05:52 PM

Data Sourced

via MITRE·05:52 PM

DescriptionSeverityWeakness

Frequently Asked Questions

Who can exploit this authorization bypass?

A user who has service write permission can exploit it. The bypass allows that user to apply Envoy escape-hatch configuration without also having the required mesh write permission.

Which releases contain fixes?