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      <title>CVE-2026-63177 — Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-63177</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cisagov Malcolm&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cisagov Malcolm&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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