CVE-2026-5052

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:hashicorp:vault:::::enterprise:::*
	cpe:2.3:a:hashicorp:vault:::::-:::*
	cpe:2.3:a:hashicorp:vault:::::enterprise:::*
	cpe:2.3:a:hashicorp:vault:::::enterprise:::*

History

No history.

Information

Published : 2026-04-17 04:16

Updated : 2026-06-17 10:58

NVD link : CVE-2026-5052

Mitre link : CVE-2026-5052

CVE.ORG link : CVE-2026-5052

JSON object : View

Products Affected

hashicorp

vault

CWE

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-5052", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5052", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-17T13:19:57.168697Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@hashicorp.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@hashicorp.com", "affectedData": [{"repo": "https://github.com/hashicorp/vault", "vendor": "HashiCorp", "product": "Vault", "versions": [{"status": "affected", "version": "1.15.0", "lessThan": "2.0.0", "versionType": "semver"}], "platforms": ["64 bit", "32 bit", "x86", "ARM", "MacOS", "Windows", "Linux"], "defaultStatus": "unaffected"}, {"repo": "https://github.com/hashicorp/vault", "vendor": "HashiCorp", "product": "Vault Enterprise", "versions": [{"status": "affected", "changes": [{"at": "1.19.16", "status": "unaffected"}, {"at": "1.20.10", "status": "unaffected"}, {"at": "1.21.5", "status": "unaffected"}], "version": "1.15.0", "lessThan": "2.0.0", "versionType": "semver"}], "platforms": ["64 bit", "32 bit", "x86", "ARM", "MacOS", "Windows", "Linux"], "defaultStatus": "unaffected"}]}], "published": "2026-04-17T04:16:12.567", "references": [{"url": "https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343", "tags": ["Vendor Advisory"], "source": "security@hashicorp.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@hashicorp.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "Vault\u2019s PKI engine\u2019s 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."}], "lastModified": "2026-06-17T10:58:20.573", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "5EF70F5F-D939-4808-9F03-57745D1333B3", "versionEndExcluding": "1.19.16", "versionStartIncluding": "1.14.0"}, {"criteria": "cpe:2.3:a:hashicorp:vault:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "64F0763E-552C-4882-A66F-D7CE8D13B7CD", "versionEndExcluding": "2.0.0", "versionStartIncluding": "1.14.0"}, {"criteria": "cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "E2135CCF-F6D8-41AC-8D0C-F763F63974B4", "versionEndExcluding": "1.20.10", "versionStartIncluding": "1.20.0"}, {"criteria": "cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "C8097BD2-0B19-4BA7-930E-93A5A89EC4AF", "versionEndExcluding": "1.21.5", "versionStartIncluding": "1.21.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@hashicorp.com"}