CVE-2026-63177: 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…

PriorityP343high7.1CVSS 3.1

AVNACLPRLUINSUCHILAN

EPSS

0.30%

20.5th percentile

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
cisagov	malcolm	< 26.07.0	26.07.0

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