CVE-2026-5052

MEDIUM5.3EPSS 0.02%

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

Published: 4/17/2026Modified: 4/28/2026

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.

Affected packages (2)

Bitnami/vault>= 0.10.0, < 2.0.0
Go/github.com/hashicorp/vault>= 1.14.0, <= 1.21.4

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (3)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-5052
PATCHhttps://github.com/hashicorp/vault
WEBhttps://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343