Is CVE-2026-63177 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63177?

CVE-2026-63177 has a CVSS v3 severity of HIGH (7.1).

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CVE-2026-63177

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.