---
cve: "CVE-2026-63177"
severity: "HIGH"
cvss: 7.1
epss: "18%"
vendor: "cisagov"
kev: false
exploited: false
published: "2026-08-11 21:17:44"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T08:38:47+02:00"
---

# CVE-2026-63177

> 7.1 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 551ce2d94052f986a14662aabb85eecfe96d0a30 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63177) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_