CVE-2026-5052: Hashicorp Vault

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

Vault’s PKI engine’s ACME validation did not reject local targets when issuing http-01 and tls-alpn-01 challenges. This may lead to these requests being sent to local network targets, potentially leading to information disclosure. Fixed in Vault Community Edition 2.0.0 and Vault Enterprise 2.0.0, 1.21.5, 1.20.10, and 1.19.16.

Affected products

• Hashicorp Vault: from 1.14.0, before 1.19.16 (fixed in 1.19.16); from 1.14.0, before 2.0.0 (fixed in 2.0.0); from 1.20.0, before 1.20.10 (fixed in 1.20.10); from 1.21.0, before 1.21.5 (fixed in 1.21.5)

Published 2026-04-17. Last modified 2026-06-17.