---
id: CVE-2026-71492
title: Banks generates meaningful LLM prompts using a simple template language
summary: >-
  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 in…
severity: medium
cwe:
  - CWE-22
vendor: banks
product: banks
affected:
  - banks < 2.4.5
patched:
  - banks 2.4.5
published: '2026-08-20'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71492'
references:
  - url: >-
      https://github.com/masci/banks/commit/a215f6d779966945c56e0af5abed1ae5916fd9d3
    label: security-advisories@github.com
  - url: 'https://github.com/masci/banks/pull/77'
    label: security-advisories@github.com
  - url: 'https://github.com/masci/banks/releases/tag/v2.4.5'
    label: security-advisories@github.com
  - url: 'https://github.com/masci/banks/security/advisories/GHSA-x8wg-4xgc-vr54'
    label: security-advisories@github.com
  - url: 'https://github.com/masci/banks/security/advisories/GHSA-x8wg-4xgc-vr54'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71492'
  - url: 'https://github.com/masci/banks'
  - url: 'https://pypi.org/project/banks'
  - url: 'https://github.com/advisories/GHSA-x8wg-4xgc-vr54'
tags:
  - nvd
  - osv
  - pip
  - ghsa
epss: 0.00398
epssPercentile: 0.33848
aliases:
  - GHSA-x8wg-4xgc-vr54
  - PYSEC-2026-3810
ecosystem: pip
ingestedAt: '2026-09-02T14:45:29.970Z'
---

## Overview

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.

## Remediation

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

## Package advisory (CVE-2026-71492)

Affected packages:

- `banks < 2.4.5`

Patched in:

- `banks 2.4.5`

Source: https://osv.dev/vulnerability/GHSA-x8wg-4xgc-vr54