OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-63131US | —OT elevated | — | ||
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 t… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203WEB
- https://github.com/openbao/openbao/commit/2e9625d6cebe4639d051ef53dd6ce7c49914ae6aWEB
- https://github.com/openbao/openbao/commit/f58d848c139e5ba71aa63103fcfe101972b999fcWEB
- https://github.com/openbao/openbao/pull/3389WEB
- https://github.com/openbao/openbao/pull/3474WEB
- https://github.com/openbao/openbao/releases/tag/v2.6.0WEB
- https://github.com/openbao/openbao/security/advisories/GHSA-xp3c-3jw3-4vcrWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-63131WEB
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