---
cve: "CVE-2026-71492"
severity: "MEDIUM"
cvss: 6.0
epss: "0.5%"
vendor: "masci"
kev: false
exploited: false
published: "2026-08-20 16:13:55"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-09T22:52:45+02:00"
---

# CVE-2026-71492

> 6.0 MEDIUM · 🧪 PoC

## Beschreibung

Banks generates meaningful LLM prompts using a simple template language. Prior to version 2.4.5, DirectoryPromptRegistry.set() in src/banks/registries/directory.py interpolates attacker-controlled Prompt.name and Prompt.version values into a Path without canonicalization or containment validation. Relative traversal such as ../victim/foo and an absolute Prompt.name can escape or discard the configured registry root, while overwrite=True permits replacement of existing target files. The poisoned name is persisted in index.json and reconstructed by _load(), allowing the out-of-root path to survive later registry loads. An application that forwards request data into these fields can therefore write Prompt.raw bytes to attacker-chosen paths writable by the application process. This issue is fixed in version 2.4.5.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a215f6d779966945c56e0af5abed1ae5916fd9d3 (Commit)
- ae351d7716451cda07a466646e8bb6556fe600a8 (Commit)

## Referenzen

- <https://github.com/masci/banks/security/advisories/GHSA-x8wg-4xgc-vr54>
- <https://github.com/masci/banks/pull/77>
- <https://github.com/masci/banks/commit/a215f6d779966945c56e0af5abed1ae5916fd9d3>
- <https://github.com/masci/banks/releases/tag/v2.4.5>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-71492/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_