CVE-2026-5052Medium· 5.3▾ SunlitHashiCorp Vault has Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.3%
0.3% → 0.3%
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.
github.com/hashicorp/vault >= 1.14.0, <= 1.21.4Refer to the advisory for the patched release.
Connected by shared product, vendor, weakness, or advisory.
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