What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-17 · updated 2026-10-26
• Weakness: CWE-770

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.

Affected products

• HashiCorp Vault: before 2.0.0 — fixed in 2.0.0

How to fix

Upgrade to a fixed version: HashiCorp Vault 2.0.0. Check the vendor advisory for mitigations.

References

• https://discuss.hashicorp.com/t/hcsec-2026-08-vault-vulnerable-to-denial-of-service-via-unauthenticated-root-token-generation-rekey-operations/77345
• https://access.redhat.com/security/cve/CVE-2026-5807
• https://bugzilla.redhat.com/show_bug.cgi?id=2459109
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5807.json

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