CVE-2026-5052: Github.com/hashicorp/vault HashiCorp Vault Has Server-Side Request Vulnerability

MODERATE
Advisory Identifier: GHSA-8r5m-3f66-qpr3
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CVSS 5.3
CWE-918
Published
Advisory Summary

CVE-2026-5052 is a MODERATE (CVSS 5.3) hashicorp vault has server-side request vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Github.com/hashicorp/vault libraries in the Go ecosystem. The issue involves hashicorp vault has server-side request forgery in acme challenge validation via attacker-controlled dns. Remediation is available in the latest vendor maintenance releases.

CVE-2026-5052 at a Glance

CVE Identifier CVE-2026-5052
GHSA Identifier GHSA-8r5m-3f66-qpr3
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Github.com/hashicorp/vault
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-5052

To remediate this vulnerability, upgrade all affected Github.com/hashicorp/vault dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/hashicorp/vault fixed: Latest secure release 
Upgrade github.com/hashicorp/vault to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/hashicorp/vault

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-5052, inspect your project dependencies for Github.com/hashicorp/vault:

inspect dependencies for github.com/hashicorp/vault

Analyze the terminal output to locate any version of Github.com/hashicorp/vault in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Github.com/hashicorp/vault, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-5052 Affected Github.com/hashicorp/vault Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hashicorp/vault
golang/github.com/hashicorp/vault
Go
≥ 1.14.0
≤ 1.21.4

References

NVD — CVE-2026-5052 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5052
discuss.hashicorp.com/t/hcsec-2026-06-vau... WEB
https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-8r5m-3f66-qpr3
Github.com/hashicorp/vault Source Repository REPOSITORY
https://github.com/hashicorp/vault

Frequently Asked Questions

What is CVE-2026-5052?
CVE-2026-5052 is a security vulnerability in Github.com/hashicorp/vault involving HashiCorp Vault has Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS under CWE-918: Server-Side Request Forgery (SSRF).
Which Github.com/hashicorp/vault versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/hashicorp/vault.
What version fixes CVE-2026-5052?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/hashicorp/vault affected?
Yes, github.com/hashicorp/vault is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-5052?
CVE-2026-5052 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-5052?
CVE-2026-5052 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Go dependencies for CVE-2026-5052?
Run the dependency tree command: 'inspect dependencies for github.com/hashicorp/vault'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8r5m-3f66-qpr3",
  "modified" : "2026-07-21T13:57:05Z",
  "published" : "2026-04-17T06:31:07Z",
  "aliases" : [ "CVE-2026-5052" ],
  "summary" : "HashiCorp Vault has Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/vault"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.14.0"
      }, {
        "last_affected" : "1.21.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-5052"
  }, {
    "type" : "WEB",
    "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"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-8r5m-3f66-qpr3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/vault"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-18T00:53:25Z",
    "nvd_published_at" : "2026-04-17T04:16:12Z"
  }
}