Vulnerability · Published Apr 17, 2026 · Assigned by HashiCorp
CVE-2026-5052Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS
Medium 5.3
In plain English
A medium-severity server-side request forgery in Vault from HashiCorp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 71.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/hashicorp/vault | no fix listed | GHSA-8r5m-3f66-qpr3 |
| Go | github.com/hashicorp/vault | no fix listed | GO-2026-5262 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| HashiCorp | Vault | 1.15.0 – before 2.0.0 |
| HashiCorp | Vault Enterprise | 1.15.0 – before 2.0.0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N