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CVE-2026-5052

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

Published: Apr 17, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-918
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 75.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

vaulthashicorp
SaaSSaaS Service
Cloud & SaaS
VaultHashiCorp
SaaSSaaS Service
Cloud & SaaS
Vault EnterpriseHashiCorp
SaaSSaaS Service
Cloud & SaaS
hashicorpcommercialUSCloud & SaaSaka hashicorp inc.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

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
discuss.hashicorp.com

Timeline

Published
Apr 17, 2026
Last Updated
Apr 27, 2026

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