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Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

CVE-2026-63131OpenBao LIST ACL bypass: a trailing-slash LIST request skips a more-specific deny rule (unported Vault v2.0.3 fix)

Medium 6.0

In plain English

A medium-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 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium
Exploit odds (30 days)0.5%top 58.1% 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 2.6.0, 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/openbao/openbao0.0.0-20260713133043-f58d848c139eGHSA-xp3c-3jw3-4vcr
Gogithub.com/openbao/openbaono fix listedGHSA-xp3c-3jw3-4vcr
Gogithub.com/openbao/openbao0.0.0-20260713133043-f58d848c139eGO-2026-6579

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.6.0

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

References