# CVE-2026-55774: OpenBao cross-namespace lease revocation and renewal bypass

Source: https://junglewise.ai/threats/cve-2026-55774-openbao-cross-namespace-lease-revocation-and-renewal-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-06-19  
License: CC BY 4.0 with a link back

CVE-2026-55774 · Severity: medium · CVSS 4 · Published 2026-09-15

OpenBao is a security tool used to manage sensitive credentials and secrets across different organizational groups (namespaces). A vulnerability exists where a user in one group can prematurely cancel or renew security credentials belonging to a different group if they know the specific credential ID. This could lead to service disruptions or unauthorized access changes if credential identifiers are leaked between tenants.

Technologies: [github.com/openbao/openbao (Go)](https://junglewise.ai/threats/technologies/github-com-openbao-openbao), [OpenBao](https://junglewise.ai/threats/technologies/openbao). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [OpenBao](https://junglewise.ai/threats/vendors/openbao).

## Quick answers

**Is CVE-2026-55774 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55774 being exploited in the wild.

**How severe is CVE-2026-55774?** Medium severity, with a CVSS score of 4, published 15 September 2026.

**Which products and versions are affected?** github.com/openbao/openbao (Go) SEMVER:introduced=0,fixed=0.0.0-20260617103932-b20b999dd404,introduced=0.1.0, SEMVER:introduced=0.1.0,last_affected=2.5.4; OpenBao >= 0.1.0, <= 2.5.4.

**Is there a fix for CVE-2026-55774?** Yes. github.com/openbao/openbao (Go): upgrade to 0.0.0-20260617103932-b20b999dd404 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55774 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-55774?** Check whether you run github.com/openbao/openbao (Go) or OpenBao at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/openbao/openbao (Go): upgrade to 0.0.0-20260617103932-b20b999dd404 or later

  ```sh
  go get github.com/openbao/openbao@v0.0.0-20260617103932-b20b999dd404
  ```


## Technical details

An authorization bypass vulnerability exists in OpenBao's lease management system due to an incomplete fix for a previous issue. Users with access to the 'sys/leases/revoke/:lease_id' or 'sys/leases/renew/:lease_id' endpoints can perform actions on leases outside their own namespace. The root cause is a failure to properly enforce namespace boundaries when processing lease identifiers at these canonical endpoints. An attacker with high privileges in one namespace who obtains a lease ID from another namespace can trigger unauthorized revocation or renewal. This issue is addressed in OpenBao v2.5.5.

## Affected products

- OpenBao OpenBao >= 0.1.0, <= 2.5.4

## Identifiers

- CVE-2026-55774
- GHSA-c36x-h252-g9x2
- GO-2026-5304

## Timeline

- 2026-06-19: advisory: GitHub Advisory GHSA-c36x-h252-g9x2 published
- 2026-06-19: disclosed
- 2026-06-17: patched: Fix committed to repository

## References

- [https://api.github.com/users/anir0y](https://api.github.com/users/anir0y)
- [https://github.com/anir0y](https://github.com/anir0y)
- [https://api.github.com/users/anir0y/gists%7B/gist_id%7D](https://api.github.com/users/anir0y/gists%7B/gist_id%7D)
- [https://api.github.com/users/anir0y/repos](https://api.github.com/users/anir0y/repos)
- [https://avatars.githubusercontent.com/u/29829469?v=4](https://avatars.githubusercontent.com/u/29829469?v=4)
- [https://api.github.com/users/anir0y/events%7B/privacy%7D](https://api.github.com/users/anir0y/events%7B/privacy%7D)

## Related threats

- [OpenBao policy cache incorrect authorization via namespace traversal](https://junglewise.ai/threats/cve-2026-115365-openbao-from-2-3-0-before-2-6-3-contains-an-incorrect)
- [OpenBao ACL bypass in policy denial evaluation](https://junglewise.ai/threats/cve-2026-115361-openbao-before-2-6-3-contains-an-acl-bypass-vulnerability-that)
- [OpenBao Kubernetes Auth token renewal on revoked credentials](https://junglewise.ai/threats/cve-2026-115356-openbao-before-2-6-4-and-2-7-x-before-2-7-1-does-not-verify-when)
- [OpenBao Agent information disclosure via stdout in exec rendering mode](https://junglewise.ai/threats/cve-2026-77285-openbao-agent-information-disclosure-via-stdout-in-exec-rendering)
- [OpenBao recovery mode timing attack token leakage](https://junglewise.ai/threats/cve-2026-63132-openbao-recovery-mode-timing-attack-token-leakage)