CVE-2026-5052 — Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS

CVE-2026-5052

Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
HashiCorp / Vault	affected 1.15.0 before 2.0.0
HashiCorp / Vault Enterprise	affected 1.15.0 before 2.0.0

CWE

CWE-918

References

https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.