---
id: CVE-2026-107336
title: >-
  Malcolm's front nginx reverse proxy defines a "Dashboards → Arkime shortcut"
  location using a case-insensitive regex matcher but a case-sensitive rewrite
summary: >-
  Malcolm's front nginx reverse proxy defines a "Dashboards → Arkime shortcut"
  location using a case-insensitive regex matcher but a case-sensitive rewrite.
  A request whose path segment is not exact-lowercase (for example
  /IDDASH2ARK/...) …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-290
  - CWE-441
  - CWE-863
vendor: CISA
product: Malcolm
affected:
  - Malcolm <= 26.07.1
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:03:43.847'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107336'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-7j32-cf27-cp6h'
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-08T17:56:11.740Z'
---

## Overview

Malcolm's front nginx reverse proxy defines a "Dashboards → Arkime shortcut" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.