CVE-2026-63177
7.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
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 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cisagov | Malcolm | < 26.07.0 | affected |
Weaknesses
- CWE-863: CWE-863: Incorrect Authorization
References
- https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r
- https://github.com/cisagov/Malcolm/releases/tag/v26.07.0
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