CVE-2026-63177 | BDVDB-2026-357740 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-08-11Record published in the CVE List.
2. Version 22026-10-02Most recent update recorded in the CVE List.