CVE-2026-5052CWE-918

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

Medium · published April 17, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-04-17T02:55Z
EPSS history
Timeline
  • 17 APR 02:55Z
    Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
    cvelistv5