What’s Vulnerable › Vulnerabilities
CVE-2026-5052: Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% 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-918
Description
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; from 1.14.0 before 2.0.0; from 1.20.0 before 1.20.10; from 1.21.0 before 1.21.5 — fixed in 1.19.16, 2.0.0, 1.20.10, 1.21.5
How to fix
Upgrade to a fixed version: HashiCorp Vault 1.19.16, 2.0.0, 1.20.10, 1.21.5. Check the vendor advisory for mitigations.
References
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