CVE-2025-6037: Hashicorp Vault has Incorrect Validation for Non-CA Certificates

August 1, 2025

Vault and Vault Enterprise (“Vault”) TLS certificate auth method did not correctly validate client certificates when configured with a non-CA certificate as [+trusted certificate+|https://developer.hashicorp.com/vault/api-docs/auth/cert#certificate]. In this configuration, an attacker may be able to craft a malicious certificate that could be used to impersonate another user. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23.

References

discuss.hashicorp.com/t/hcsec-2025-18-vault-certificate-auth-method-did-not-validate-common-name-for-non-ca-certificates/76037
github.com/advisories/GHSA-6c5r-4wfc-3mcx
github.com/hashicorp/vault
nvd.nist.gov/vuln/detail/CVE-2025-6037

Code Behaviors & Features

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