CVE-2026-63177 - Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC
Brief
CVE ID : CVE-2026-63177
Published : Aug. 11, 2026, 8:30 p. m.
- 33 minutes ago
Description : Malcolm is a network traffic analysis tool suite. Prior to version 26.
- 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.
- 0 fixes the issue.
Severity: 0.0
- NA
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