discuss.hashicorp.com
https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343 CVE-2026-5052
MEDIUM
Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
Record summary
CVE-2026-5052 has a selected CVSS score of 5.3 (medium).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableYes
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Apr 17, 2026 · Source: CVE List
Affected products and versions
3| Product | Source | Version range | Status |
|---|---|---|---|
Default status: unaffected | CVE List | 1.15.0 to < 2.0.0 | affected |
Vault EnterpriseBrowse HashiCorp / Vault EnterpriseDefault status: unaffected | CVE List | 1.15.0 to < 2.0.0 | affected |
github.com/hashicorp/vaultBrowse Go / github.com/hashicorp/vault | GitHub Advisory | 1.14.0 to ≤ 1.21.4 | affected |
References
4github.com
https://github.com/advisories/GHSA-8r5m-3f66-qpr3 github.com
https://github.com/hashicorp/vault nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-5052