CVE-2026-5807 Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Operations

What is CVE-2026-5807?

CVE-2026-5807 is a high-severity denial of service vulnerability in Hashicorp Vault, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vault is vulnerable to a denial-of-service condition where an unauthenticated attacker can repeatedly initiate or cancel root token generation or rekey operations, occupying the single in-progress operation slot. This prevents legitimate operators from completing these workflows. This vulnerability, CVE-2026-5807, is fixed in Vault Community Edition 2.0.0 and Vault Enterprise 2.0.0.

Weakness: CWE-770

Which versions are affected by CVE-2026-5807?

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

Products include Hashicorp Vault.

How do I fix CVE-2026-5807?

Upgrade to a fixed version.

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-2026-5807 being exploited?

There is no known exploitation of CVE-2026-5807 in the wild and no public exploit code.

Other vulnerabilities in Hashicorp Vault

• CVE-2020-35192 Hardcoded credentials in n/a Critical 9.8
• CVE-2020-12757 Improper Input Validation in HashiCorp Vault Critical 9.8
• CVE-2025-6000 Arbitrary Remote Code Execution via Plugin Catalog Abuse Critical 9.1
• CVE-2022-40186 HashiCorp Vault vulnerable to incorrect metadata access Critical 9.1
• CVE-2022-36129 Missing authorization in n/a Critical 9.1

All Hashicorp Vault vulnerabilities

Sources

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

Also known as BIT-vault-2026-5807, GHSA-88v5-9hxc-f85r, GO-2026-5247, MINI-86jq-h5x3-vvgv, MINI-p83p-xp6j-6p9w.