CVE-2026-87106 Consul vulnerable to a denial of service in the native RPC listener
Authenticated clients can exhaust server memory in Consul's RPC listener before ACL checks, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-87106?
CVE-2026-87106 is a medium-severity denial of service vulnerability in HashiCorp Consul, published on 10 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2026-87106?
1 open source package ship an affected version, including consul.
| Package | Affected | Fixed in |
|---|---|---|
consul Bitnami | From 1.21.0 | 2.0.4 |
How do I fix CVE-2026-87106?
Upgrade consul to 2.0.4 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-87106 being exploited?
There is no known exploitation of CVE-2026-87106 in the wild and no public exploit code.
Sources
Also known as BIT-consul-2026-87106, GHSA-q5mw-fjrj-6qmh, MINI-h774-6233-mc2m, MINI-v96g-cppw-w8wj, UBUNTU-CVE-2026-87106.