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

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Summary

CVECVE-2026-5052
StatePUBLISHED
AssignerHashiCorp
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 04:16:12 UTC
Updated2026-04-17 15:08:25 UTC
DescriptionVault’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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.000090000 probability, percentile 0.009220000 (date 2026-04-18)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA HashiCorp Vault affected 1.15.0 2.0.0 semver 64 bit, 32 bit, x86, ARM, MacOS, Windows, Linux
CNA HashiCorp Vault Enterprise affected 1.15.0 2.0.0 semver 64 bit, 32 bit, x86, ARM, MacOS, Windows, Linux

References

ReferenceSourceLinkTags
discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forge... [email protected] discuss.hashicorp.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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