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

> Attackers with influence over the prompt directory can use symlinks to read or overwrite arbitrary files outside the registry root.

- **Severity:** High 7.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Oct 2026
- **Updated:** 9 Oct 2026
- **Also known as:** GHSA-556j-vv39-8rqv, PYSEC-2026-4201

## What is CVE-2026-107716?

CVE-2026-107716 is a high-severity path traversal vulnerability in masci banks, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-59 (Improper Link Resolution Before File Access), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-107716?

3 open source packages ship an affected version, including banks.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `banks` | PyPI | All versions | 2.5.1 |
| `banks` | PyPI | All versions | 2.5.1 |
| `banks` | PyPI | All versions | 2.5.1 |

## How do I fix CVE-2026-107716?

Upgrade banks to 2.5.1 or later.

## Is CVE-2026-107716 being exploited?

There is no known exploitation of CVE-2026-107716 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107716 and fix it if it is affected.

What it is: CVE-2026-107716 is a high-severity path traversal vulnerability in masci banks, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-107716 in the wild and no public exploit code.

Affected packages and fixed versions:
- banks (PyPI): affected all versions; fixed in 2.5.1
- banks (PyPI): affected all versions; fixed in 2.5.1
- banks (PyPI): affected all versions; fixed in 2.5.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107716/ (Markdown: https://insights.sbomify.com/CVE-2026-107716/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107716
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107716
- OSV: https://osv.dev/vulnerability/CVE-2026-107716

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107716/
Summaries are generated and may contain mistakes; the official description above is the record.