CVE-2026-5052

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

State: Published
Severity: 5.3 Medium
Published: Apr 17, 2026
Updated: Apr 17, 2026
Reserved: Mar 27, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	HashiCorp

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
VaultHashiCorp	1.15.0 to before 2.0.0Affected
Vault EnterpriseHashiCorp	1.15.0 to before 2.0.0Affectedfrom 1.19.16Not affectedfrom 1.20.10Not affectedfrom 1.21.5Not affected

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

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