{"id":"CVE-2026-63131","kind":"vulnerability","aliases":["CVE-2026-63131","GHSA-xp3c-3jw3-4vcr","GO-2026-6579"],"related":[],"title":"OpenBao Skips Stricter Deny Policy for LIST operations in github.com/openbao/openbao","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.","summary":"OpenBao's ACL evaluation can apply a broader wildcard allow before a more specific deny on a child path when a LIST request is made. An authenticated user can therefore list secret paths that policy explicitly denies.","severity":"medium","cvss":6.0,"epss":0.00354,"exploited":false,"exploited_at":null,"products":[{"name":"github.com/openbao/openbao","fixed":["0.0.0-20260713133043-f58d848c139e"],"affected":">= 0.1.0, < 0.0.0-20260713133043-f58d848c139e","ecosystem":"go"}],"ecosystems":["go"],"tags":["go","openbao","package","secrets-management","self-hosted"],"not_affected_if":["no-deny-policies","version-2.6.0-or-later"],"how_to_check":null,"fix":"Upgrade github.com/openbao/openbao to 0.0.0-20260713133043-f58d848c139e or later (OpenBao 2.6.0).","status":"open","published_at":"2026-09-23T19:17:34+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","triaged_at":"2026-10-23T21:48:47+00:00","updated_at":"2026-10-23T21:48:47+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-10-23T21:48:47Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade github.com/openbao/openbao to 0.0.0-20260713133043-f58d848c139e or later (OpenBao 2.6.0).","reach":"unknown","impact":"medium","summary":"OpenBao's ACL evaluation can apply a broader wildcard allow before a more specific deny on a child path when a LIST request is made. An authenticated user can therefore list secret paths that policy explicitly denies.","category":"package","who_cares":["openbao","go","self-hosted","secrets-management"],"confidence":0.8,"needs_auth":"yes","worst_case":"Attacker lists names under paths explicitly denied by ACL policy.","analyst_note":"","how_to_check":"unknown","needs_analyst":false,"not_affected_if":["no-deny-policies","version-2.6.0-or-later"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00084,"input_tokens":3033,"output_tokens":1073,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,22A,25A '-63131':15A,26A '-6579':23A '/openbao/openbao':12A,29A '2.6.0':89C,157C '3jw3':19A '4vcr':20A 'acl':41B,98C,107C 'advisori':147C 'affect':149C 'allow':48B,135C 'appli':44B 'authent':65B 'base':83C 'broader':46B,96C 'capabl':110C 'child':56B,124C 'could':93C,133C 'cve':13A,24A 'deni':4A,53B,75B,111C,127C,138C 'evalu':42B,94C 'explicit':74B 'fix':154C 'ghsa':17A 'ghsa-xp3c-3jw3-4vcr':16A 'github.com':11A,28A 'github.com/openbao/openbao':10A,27A 'go':21A,30B 'grant':99C 'host':38B 'ident':82C 'identity-bas':81C 'issu':152C 'list':7A,60B,69B,114C,121C,136C 'lookup':132C 'made':63B 'manag':35B,85C 'more-specif':101C 'open':79C 'openbao':1A,31B,39B,76C,90C 'oper':8A,115C,141C 'outsid':144C 'packag':32B 'parent':118C 'path':57B,71B,108C,119C,125C,139C 'permit':120C 'polici':5A,73B 'prior':87C 'repositori':146C 'request':61B 'scope':150C 'secret':34B,70B,84C 'secrets-manag':33B 'self':37B 'self-host':36B 'skip':2A 'slash':131C 'sourc':80C 'specif':52B,103C 'stricter':3A 'system':86C 'therefor':68B,134C 'trail':105C,130C 'trailing-slash':129C 'trailing-wildcard':104C 'type':142C 'user':66B 'vault/policy/acl.go':92C 'version':156C 'wildcard':47B,97C,106C 'xp3c':18A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-09-23T19:17:34+00:00","kev":null,"cvss_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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"govuln","external_id":"GO-2026-6579","url":"https://pkg.go.dev/vuln/GO-2026-6579","severity":null,"published_at":"2026-10-01T20:23:38+00:00","modified_at":"2026-10-01T20:23:38+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","fetched_at":"2026-10-23T19:13:08+00:00","note":null},{"source":"epss","external_id":"CVE-2026-63131","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-63131","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:43+00:00","fetched_at":"2026-10-23T19:13:43+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-63131","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63131","severity":null,"published_at":"2026-09-23T19:17:34+00:00","modified_at":"2026-09-29T19:06:32+00:00","first_seen_at":"2026-10-23T19:35:23+00:00","fetched_at":"2026-10-23T19:35:23+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}