{"id":"CVE-2026-63177","title":"Malcolm is a network traffic analysis tool suite","summary":"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 usi…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-863"],"vendor":"cisagov","product":"Malcolm","affected":["Malcolm < 26.07.0"],"published":"2026-08-11","updated":"2026-10-02","sourceUpdated":"2026-10-02T21:16:56.163","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63177","references":[{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json","label":"ics-cert@hq.dhs.gov"},{"url":"https://github.com/cisagov/Malcolm/releases/tag/v26.07.0","label":"ics-cert@hq.dhs.gov"},{"url":"https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r","label":"ics-cert@hq.dhs.gov"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01","label":"ics-cert@hq.dhs.gov"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-12T22:07:37.481958Z"},"epss":0.00369,"epssPercentile":0.3058,"ingestedAt":"2026-09-09T21:22:45.530Z","slug":"CVE-2026-63177","body":"## Overview\n\nMalcolm 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}