CVE-2026-5807: Github.com/hashicorp/vault HashiCorp Vault Vulnerable To Denial-of-Service Vulnerability

HIGH
Advisory Identifier: GHSA-88v5-9hxc-f85r
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CVSS 7.5
CWE-770
Published
Advisory Summary

CVE-2026-5807 is a HIGH (CVSS 7.5) hashicorp vault vulnerable to denial-of-service vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Github.com/hashicorp/vault libraries in the Go ecosystem. The issue involves hashicorp vault vulnerable to denial-of-service via unauthenticated root token generation/rekey operations. Remediation is available in the latest vendor maintenance releases.

CVE-2026-5807 at a Glance

CVE Identifier CVE-2026-5807
GHSA Identifier GHSA-88v5-9hxc-f85r
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Github.com/hashicorp/vault
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:N/A:H).

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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-5807

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-2026-5807, 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. 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 is vulnerable to a denial-of-service condition where an unauthenticated attacker can repeatedly initiate or cancel root token generation or rekey operations, occupying the single in-progress operation slot. This prevents legitimate operators from completing these workflows. This vulnerability, CVE-2026-5807, is fixed in Vault Community Edition 2.0.0 and Vault Enterprise 2.0.0.

CVE-2026-5807 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
≤ 1.21.4

References

NVD — CVE-2026-5807 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5807
Github.com/hashicorp/vault Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-5807
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2459109
discuss.hashicorp.com/t/hcsec-2026-08-vau... WEB
https://discuss.hashicorp.com/t/hcsec-2026-08-vault-vulnerable-to-denial-of-service-via-unauthenticated-root-token-generation-rekey-operations/77345
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-88v5-9hxc-f85r
Github.com/hashicorp/vault Source Repository REPOSITORY
https://github.com/hashicorp/vault
Github.com/hashicorp/vault Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5807.json

Frequently Asked Questions

What is CVE-2026-5807?
CVE-2026-5807 is a security vulnerability in Github.com/hashicorp/vault involving HashiCorp Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Operations under CWE-770: Allocation of Resources Without Limits or Throttling.
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-2026-5807?
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-2026-5807?
CVE-2026-5807 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-5807?
CVE-2026-5807 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check Go dependencies for CVE-2026-5807?
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-88v5-9hxc-f85r",
  "modified" : "2026-07-21T13:50:35Z",
  "published" : "2026-04-17T06:31:08Z",
  "aliases" : [ "CVE-2026-5807" ],
  "summary" : "HashiCorp Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Operations",
  "details" : "Vault is vulnerable to a denial-of-service condition where an unauthenticated attacker can repeatedly initiate or cancel root token generation or rekey operations, occupying the single in-progress operation slot. This prevents legitimate operators from completing these workflows. This vulnerability, CVE-2026-5807, is fixed in Vault Community Edition 2.0.0 and Vault Enterprise 2.0.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/vault"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.21.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-5807"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-5807"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2459109"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.hashicorp.com/t/hcsec-2026-08-vault-vulnerable-to-denial-of-service-via-unauthenticated-root-token-generation-rekey-operations/77345"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-88v5-9hxc-f85r"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/vault"
  }, {
    "type" : "WEB",
    "url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5807.json"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-18T00:53:47Z",
    "nvd_published_at" : "2026-04-17T05:16:19Z"
  }
}