Advisoriesby IbisHashiCorpCVE-2026-87106
HashiCorp Consul: denial of service
Fix: upgrade to 2.0.4 or later (2 fixed versions below)
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Consul Product | >= 1.21.0, < 2.0.4 | 2.0.4 |
| Consul Enterprise Product | >= 1.21.0, < 2.0.4 | 2.0.4 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-400