Bug 2539612 (CVE-2026-63131)

Summary: CVE-2026-63131 github.com/openbao/openbao: OpenBao: Information disclosure via Access Control List (ACL) bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenBao, an open source identity-based secrets management system. This vulnerability allows an authenticated attacker to bypass Access Control List (ACL) deny rules for LIST operations. By sending a specially crafted LIST request with a trailing-slash, an attacker can list paths that should otherwise be denied, leading to unauthorized information disclosure.
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Description OSIDB Bzimport 2026-09-23 18:23:01 UTC 
OpenBao is an open source identity-based secrets management system. Prior to 2.6.0, OpenBao's vault/policy/acl.go could evaluate a broader wildcard ACL grant before more-specific trailing-wildcard ACL paths with capabilities = ["deny"] for a LIST operation. When a parent path permitted LIST and a child path was denied, the trailing-slash lookup could therefore allow listing the denied path. Other operation types are outside the repository advisory's affected scope. This issue is fixed in version 2.6.0.