CVE-2026-45808: Github.com/openbao/openbao OpenBao's Cross-namespace Lease Revocation Vulnerability

HIGH
Advisory Identifier: GHSA-v8v8-cm84-m686
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CWE-863
Published
Advisory Summary

CVE-2026-45808 is a HIGH openbao's cross-namespace lease revocation vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/openbao/openbao libraries in the Go ecosystem. The issue involves openbao's cross-namespace lease revocation via legacy sys/revoke path bypasses acl. Remediation is available by upgrading affected packages to version 2.5.4.

CVE-2026-45808 at a Glance

CVE Identifier CVE-2026-45808
GHSA Identifier GHSA-v8v8-cm84-m686
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Github.com/openbao/openbao
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-45808

To remediate this vulnerability, upgrade all affected Github.com/openbao/openbao 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/openbao/openbao fixed: 2.5.4 
Upgrade github.com/openbao/openbao to 2.5.4
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/openbao/openbao

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-45808, inspect your project dependencies for Github.com/openbao/openbao:

inspect dependencies for github.com/openbao/openbao

Analyze the terminal output to locate any version of Github.com/openbao/openbao in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.4), 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Github.com/openbao/openbao, 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

# Impact OpenBao's namespaces provide multi-tenant separation. A tenant who intentionally leaks lease identifiers can have their lease and underlying credential revoked or renewed by a user in another tenant via the legacy, undocumented `sys/revoke` and `sys/renew` endpoints. # Patch This will be addressed in v2.5.4.

CVE-2026-45808 Affected Github.com/openbao/openbao Versions

1 component(s)
Fixed Versions:
2.5.4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/openbao/openbao
golang/github.com/openbao/openbao
Go
< 2.5.4
2.5.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openbao/openbao/security/advisories/GHSA-v8v8-cm84-m686
Github.com/openbao/openbao Source Repository REPOSITORY
https://github.com/openbao/openbao/pull/3152
Security Fix Commit FIX COMMIT
https://github.com/openbao/openbao/commit/c0495646b41cea0e3f5a1030132e9cf5c2375b5c
Github.com/openbao/openbao Source Repository REPOSITORY
https://github.com/openbao/openbao
Github.com/openbao/openbao Release RELEASE
https://github.com/openbao/openbao/releases/tag/v2.5.4

Frequently Asked Questions

What is CVE-2026-45808?
CVE-2026-45808 is a security vulnerability in Github.com/openbao/openbao involving OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL under CWE-863: Incorrect Authorization.
Which Github.com/openbao/openbao versions are affected?
Affected versions include releases prior to 2.5.4 across affected packages: github.com/openbao/openbao.
What version fixes CVE-2026-45808?
Upgrading to 2.5.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/openbao/openbao affected?
Yes, github.com/openbao/openbao is affected in releases prior to 2.5.4. Upgrade your dependency to 2.5.4 or later.
What CWE is associated with CVE-2026-45808?
CVE-2026-45808 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Go dependencies for CVE-2026-45808?
Run the dependency tree command: 'inspect dependencies for github.com/openbao/openbao'. 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-v8v8-cm84-m686",
  "modified" : "2026-05-28T17:37:32Z",
  "published" : "2026-05-28T17:37:32Z",
  "aliases" : [ "CVE-2026-45808" ],
  "summary" : "OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL",
  "details" : "# Impact\n\nOpenBao's namespaces provide multi-tenant separation. A tenant who intentionally leaks lease identifiers can have their lease and underlying credential revoked or renewed by a user in another tenant via the legacy, undocumented `sys/revoke` and `sys/renew` endpoints.\n\n# Patch\n\nThis will be addressed in v2.5.4.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openbao/openbao"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.5.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.5.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openbao/openbao/security/advisories/GHSA-v8v8-cm84-m686"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openbao/openbao/pull/3152"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openbao/openbao/commit/c0495646b41cea0e3f5a1030132e9cf5c2375b5c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openbao/openbao"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openbao/openbao/releases/tag/v2.5.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-28T17:37:32Z",
    "nvd_published_at" : null
  }
}