What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 2.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-25
• Weakness: CWE-863

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 products

• openbao: before 2.5.5

References

• https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540
• https://github.com/openbao/openbao/commit/b20b999dd4044d7b419a5472d8fe08407828be37
• https://github.com/openbao/openbao/pull/3307
• https://github.com/openbao/openbao/pull/3310
• https://github.com/openbao/openbao/releases/tag/v2.5.5
• https://github.com/openbao/openbao/releases/tag/v2.6.0
• https://github.com/openbao/openbao/security/advisories/GHSA-c36x-h252-g9x2

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