{"id":"CVE-2026-115366","kind":"vulnerability","aliases":["CVE-2026-115366"],"related":[],"title":"OpenBao: child-namespace tokens can modify plugin registrations, causing denial of service","description":"OpenBao from 2.3.0 before 2.6.3 contains an improper authorization vulnerability that allows privileged child-namespace tokens to modify plugin registrations because /v1/sys/plugins/catalog/* is not restricted to the root namespace. Attackers can remove existing registrations, create invalid ones, or register installed plugins through a child namespace's sys/ mount, causing denial of service.","summary":"OpenBao from 2.3.0 before 2.6.3 lets a privileged token in a child namespace change plugin catalog registrations, because the /v1/sys/plugins/catalog/ endpoints are not limited to the root namespace. An attacker can delete registrations, create invalid ones, or register installed plugins, which can cause denial of service.","severity":"low","cvss":2.6,"epss":0.00179,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","openbao","secrets-management","self-hosted"],"not_affected_if":["default-config"],"how_to_check":"- Check the OpenBao version with `bao version`; versions from 2.3.0 up to but not including 2.6.3 are affected.\n- Check whether namespaces are in use with `bao namespace list`; the issue needs a child namespace with a privileged token.","fix":"- Upgrade OpenBao to `2.6.3` or later.","status":"open","published_at":"2026-10-22T19:17:43+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","triaged_at":"2026-10-25T04:49:26+00:00","updated_at":"2026-10-25T04:49:26+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T04:49:26Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade OpenBao to `2.6.3` or later.","reach":"network","title":"OpenBao: child-namespace tokens can modify plugin registrations, causing denial of service","impact":"low","summary":"OpenBao from 2.3.0 before 2.6.3 lets a privileged token in a child namespace change plugin catalog registrations, because the /v1/sys/plugins/catalog/ endpoints are not limited to the root namespace. An attacker can delete registrations, create invalid ones, or register installed plugins, which can cause denial of service.","category":"infrastructure","nicknames":[],"who_cares":["openbao","self-hosted","secrets-management"],"confidence":0.6,"needs_auth":"yes","worst_case":"denial of service through plugin registration changes in child namespaces","analyst_note":"","how_to_check":"- Check the OpenBao version with `bao version`; versions from 2.3.0 up to but not including 2.6.3 are affected.\n- Check whether namespaces are in use with `bao namespace list`; the issue needs a child namespace with a privileged token.","needs_analyst":false,"not_affected_if":["default-config"],"who_is_affected":"Deployments running OpenBao 2.3.0 through 2.6.2 that use namespaces and hand out privileged tokens inside child namespaces. Single-namespace deployments and installations that do not give child-namespace tokens privileged access are less exposed.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.000604,"input_tokens":3394,"output_tokens":529,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-115366':16A,19A '-2026':15A,18A '/v1/sys/plugins/catalog':47B,96C '2.3.0':30B,76C '2.6.3':32B,78C 'allow':85C 'attack':57B,104C 'author':82C 'catalog':43B 'caus':10A,70B,123C 'chang':41B 'child':3A,39B,88C,118C 'child-namespac':2A,87C 'contain':79C 'creat':61B,109C 'cve':14A,17A 'delet':59B 'denial':11A,71B,124C 'endpoint':48B 'exist':107C 'host':27B 'improp':81C 'infrastructur':20B 'instal':66B,114C 'invalid':62B,110C 'let':33B 'limit':51B 'manag':24B 'modifi':7A,92C 'mount':122C 'namespac':4A,40B,55B,89C,103C,119C 'one':63B,111C 'openbao':1A,21B,28B,74C 'plugin':8A,42B,67B,93C,115C 'privileg':35B,86C 'regist':65B,113C 'registr':9A,44B,60B,94C,108C 'remov':106C 'restrict':99C 'root':54B,102C 'secret':23B 'secrets-manag':22B 'self':26B 'self-host':25B 'servic':13A,73B,126C 'sys':121C 'token':5A,36B,90C 'vulner':83C","nicknames":[],"mitigations":[],"who_affected":"Deployments running OpenBao 2.3.0 through 2.6.2 that use namespaces and hand out privileged tokens inside child namespaces. Single-namespace deployments and installations that do not give child-namespace tokens privileged access are less exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T19:17:43+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-115366","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115366","severity":null,"published_at":"2026-10-22T19:17:43+00:00","modified_at":"2026-10-23T14:20:57+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-115366","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-115366","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-24T07:15:51+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"}