CVE-2026-55774 OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} — incomplete fix of CVE-2026-45808
An attacker in one namespace can revoke leases in another namespace by knowing the lease ID, bypassing isolation and revoking credentials.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55774?
CVE-2026-55774 is a low-severity missing authorization vulnerability in openbao, published on 15 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation. The affected lease lookup routing in vault/expiration.go allowed FetchLeaseInfo and loadEntry to resolve cached or stored lease data outside the request namespace, allowing a tenant that intentionally disclosed a lease identifier to have the lease and its underlying credential revoked by another tenant. This issue is fixed in version 2.5.5.
Weakness: CWE-863
Which versions are affected by CVE-2026-55774?
6 open source packages ship an affected version, including github.com/openbao/openbao and openbao.
| Package | Affected | Fixed in |
|---|---|---|
github.com/openbao/openbao Go | All versions | 0.0.0-20260617103932-b20b999dd404 |
github.com/openbao/openbao Go | All versions | 0.0.0-20260617103932-b20b999dd404 |
github.com/openbao/openbao Go | All versions | 0.0.0-20260617103932-b20b999dd404 |
github.com/openbao/openbao Go | From 0.1.0 to 2.5.4 | None |
github.com/openbao/openbao Go | From 0.1.0 to 2.5.4 | None |
openbao Bitnami | All versions | 2.5.5 |
How do I fix CVE-2026-55774?
Upgrade github.com/openbao/openbao to 0.0.0-20260617103932-b20b999dd404 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-55774 being exploited?
There is no known exploitation of CVE-2026-55774 in the wild and no public exploit code.
Sources
Also known as BIT-openbao-2026-55774, GHSA-c36x-h252-g9x2, GO-2026-5304.