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Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

CVE-2026-55774OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} — incomplete fix of CVE-2026-45808

Low 2.1

In plain English

A low-severity incorrect authorization in openbao from openbao. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.1Low
Exploit odds (30 days)0.6%top 53.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/openbao/openbaono fix listedGHSA-c36x-h252-g9x2
Gogithub.com/openbao/openbao0.0.0-20260617103932-b20b999dd404GHSA-c36x-h252-g9x2
Gogithub.com/openbao/openbao0.0.0-20260617103932-b20b999dd404GO-2026-5304

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.5.5

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References