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CVE-2026-63177 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json	[email protected]
https://github.com/cisagov/Malcolm/releases/tag/v26.07.0	[email protected]
https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r	[email protected]
https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-863	Incorrect Authorization	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

5 change records found show changes

Date	Action	Recorded By
Oct 24, 2026	CVE Translated	[email protected]
Oct 23, 2026	CVE Translated	[email protected]
Oct 2, 2026	CVE Modified	[email protected]
Aug 12, 2026	CVE Modified	CISA-ADP
Aug 11, 2026	New CVE Received	[email protected]