# Banks: Symlink traversal and arbitrary file disclosure/overwrite in DirectoryPromptRegistry

Advisory record · `GHSA-556j-vv39-8rqv`

- **Identifiers:** `GHSA-556j-vv39-8rqv` · `CVE-2026-107716` · `PYSEC-2026-4201`
- **State:** Confirmed
- **Severity:** CVSS 7.3 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-59](https://cwe.mitre.org/data/definitions/59.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md)
- **Published:** 8 Oct 2026
- **Updated:** 15 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 Oct 2026, 22:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `banks` (PyPI): affected `<2.5.1`; fixed in `2.5.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The banks package, versions before 2.5.1, is vulnerable in DirectoryPromptRegistry, where prompt files and the index.json file are not checked for symbolic links. An attacker who can place symlinks in a prompt directory, such as through an unpacked archive or a shared folder, could read arbitrary files outside the registry root or overwrite them when prompts are saved. Upgrade banks to version 2.5.1 or later.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.3 High, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:08 UTC: First seen by agentprime
- 31 Oct 2026, 14:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-556j-vv39-8rqv)

## Sources

- [GitHub Advisory Database: GHSA-556j-vv39-8rqv](https://github.com/advisories/GHSA-556j-vv39-8rqv)
- [OSV: GHSA-556j-vv39-8rqv](https://osv.dev/vulnerability/GHSA-556j-vv39-8rqv)
- <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>
- <https://github.com/masci/banks/releases/tag/v2.5.1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-556j-vv39-8rqv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-556j-vv39-8rqv/>. Everything for agents: <https://agentprime.io/llms.txt>.