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

Quick assessment

Affected
HashiCorp Vault
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HashiCorp Vault和HashiCorp Vault Enterprise都是美国HashiCorp公司的产品。HashiCorp Vault是一款私钥访问管理工具。HashiCorp Vault Enterprise是一个企业信息归档平台。 HashiCorp Vault 2.0.0之前版本、HashiCorp Vault Enterprise 2.0.0之前版本、1.21.5之前版本、1.20.10之前版本和1.19.16之前版本存在安全漏洞，该漏洞源于PKI引擎的ACME验证未拒绝本地目标

CVSS 5.3 · Medium EPSS 0.39% · P31
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I. Basic Information for CVE-2026-5052

Vulnerability Information
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Vulnerability Title
Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
HashiCorp Vault和HashiCorp Vault Enterprise 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HashiCorp Vault和HashiCorp Vault Enterprise都是美国HashiCorp公司的产品。HashiCorp Vault是一款私钥访问管理工具。HashiCorp Vault Enterprise是一个企业信息归档平台。 HashiCorp Vault 2.0.0之前版本、HashiCorp Vault Enterprise 2.0.0之前版本、1.21.5之前版本、1.20.10之前版本和1.19.16之前版本存在安全漏洞，该漏洞源于PKI引擎的ACME验证未拒绝本地目标
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Vault 1.15.0 ~ 2.0.0 -
HashiCorp Vault Enterprise 1.15.0 ~ 2.0.0 -

II. Public POCs for CVE-2026-5052

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III. Intelligence Information for CVE-2026-5052

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Other References for CVE-2026-5052 (1)

Same Patch Batch · HashiCorp · 2026-04-17 · 4 CVEs total

CVE-2026-3605 8.1 HIGH Vault KVv2 Metadata and Secret Deletion Policy Bypass Denial-of-Service
CVE-2026-4525 7.5 HIGH Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header
CVE-2026-5807 7.5 HIGH Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Oper

IV. Related Vulnerabilities

Same product: Vault
Same vendor: HashiCorp
Same weakness: CWE-918

V. Comments for CVE-2026-5052

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