Vulnerability · Published Apr 17, 2026 · Assigned by HashiCorp

CVE-2026-5807Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Operations

High 7.5

In plain English

A high-severity resource allocation without limits 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 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.7%top 46.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.23	openbao	2.5.4-r0	ALPINE-CVE-2026-5807
Alpine:v3.24	openbao	2.5.4-r0	ALPINE-CVE-2026-5807
Go	github.com/hashicorp/vault	no fix listed	GHSA-88v5-9hxc-f85r
Go	github.com/hashicorp/vault	no fix listed	GO-2026-5247

Affected products (as reported)

Vendor	Product	Versions
HashiCorp	Vault	0 – before 2.0.0
HashiCorp	Vault Enterprise	0 – before 2.0.0.

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://discuss.hashicorp.com/t/hcsec-2026-08-vault-vulnerable-to-denial-of-service-via-unauthenticated-root-token-generation-rekey-operations/77345
https://access.redhat.com/security/cve/CVE-2026-5807 vdb-entry, x_refsource_REDHAT
RHBZ#2459109 issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5807.json x_sadp-csaf-vex