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Vulnerability record · CVE-2026-63177 · published 11 August 2026

CVE-2026-63177: Incorrect authorization vulnerability

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.

7.1 CVSS 3.1 High EPSS 0.30% · top 79.5% CWE-863 · Incorrect authorization Awaiting Analysis
7.1CVSS 3.1 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References

LinkTags
https://github.com/cisagov/Malcolm/releases/tag/v26.07.0
https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r

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Source: NIST National Vulnerability Database (record CVE-2026-63177), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.