{"id":"CVE-2026-63177","revision":"7621255ec47a473596f49d4bde63c8b9","records":[{"revision":"7621255ec47a473596f49d4bde63c8b9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63177","aliases":[],"title":"Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC","description":"Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, role-based access control enforced in the Nginx OpenResty Lua layer evaluates the raw, unnormalized `ngx.var.request_uri`, while Nginx itself routes requests using the normalized path. An authenticated low-privilege user can prepend a traversal segment (for example `/x/../upload/...`) so that Nginx routes the request to a restricted backend while the Lua role check fails to match any rule and falls open, granting access it should deny. Version 26.07.0 fixes the issue.","state":0,"publishedAt":"2026-08-11T20:30:57.901+00:00","modifiedAt":"2026-10-02T20:27:08.611+00:00","affected":[{"ecosystem":"Vendor product","name":"Malcolm","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cisagov\",\n                    \"product\": \"Malcolm\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"< 26.07.0\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"26.07.0\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","score":7.1,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r","https://github.com/cisagov/Malcolm/releases/tag/v26.07.0","https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01","https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63177","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63177","identifiers":["CVE-2026-63177"]},"retained":false,"historicalAffected":[]}],"coverage":[]}