CVE-2025-11374 Consul's KV endpoint is vulnerable to denial of service

What is CVE-2025-11374?

CVE-2025-11374 is a medium-severity denial of service vulnerability in HashiCorp Consul, published on 28 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Consul and Consul Enterprise’s (“Consul”) key/value endpoint is vulnerable to denial of service (DoS) due to incorrect Content Length header validation. This vulnerability, CVE-2025-11374, is fixed in Consul Community Edition 1.22.0 and Consul Enterprise 1.22.0, 1.21.6, 1.20.8 and 1.18.12.

Weakness: CWE-770

Which versions are affected by CVE-2025-11374?

4 open source packages ship an affected version, including github.com/hashicorp/consul and consul. It affects 1 product.

Products include Hashicorp Consul.

How do I fix CVE-2025-11374?

Upgrade github.com/hashicorp/consul to 1.22.0 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-2025-11374 being exploited?

There is no known exploitation of CVE-2025-11374 in the wild and no public exploit code.

Other vulnerabilities in HashiCorp Consul

• CVE-2021-41805 Privilege escalation in n/a High 8.8
• CVE-2021-37219 HashiCorp Consul Privilege Escalation Vulnerability High 8.8
• CVE-2023-2816 Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner High 8.7
• CVE-2024-10006 Consul L7 Intentions Vulnerable To Headers Bypass High 8.3
• CVE-2024-10005 Consul L7 Intentions Vulnerable To URL Path Bypass High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-consul-2025-11374, DEBIAN-CVE-2025-11374, GHSA-7g3r-8c6v-hfmr, GO-2025-4081, UBUNTU-CVE-2025-11374.