# CVE-2025-6854: chatchat-space Langchain-Chatchat files path traversal

> Remote attackers can exploit a path traversal vulnerability in the file handling endpoint to read arbitrary files from the server.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jun 2025
- **Updated:** 30 Jun 2025
- **Also known as:** GHSA-8v8h-4pjx-rg73, PYSEC-2026-1511

## What is CVE-2025-6854?

CVE-2025-6854 is a medium-severity path traversal vulnerability in chatchat-space Langchain-Chatchat, published on 29 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability classified as problematic was found in chatchat-space Langchain-Chatchat up to 0.3.1. This vulnerability affects unknown code of the file /v1/files?purpose=assistants. The manipulation leads to path traversal. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-6854?

3 open source packages ship an affected version, including langchain-chatchat. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `langchain-chatchat` | PyPI | All versions to 0.3.1 | None |
| `langchain-chatchat` | PyPI | All versions to 0.3.1 | None |
| `langchain-chatchat` | PyPI | All versions to 0.3.1 | None |

Products: Chatchat-Space Langchain-Chatchat.

## How do I fix CVE-2025-6854?

No fix has been published for CVE-2025-6854 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6854 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6854 exists.

## Other vulnerabilities in chatchat-space Langchain-Chatchat

- [CVE-2025-6853](https://insights.sbomify.com/CVE-2025-6853/): chatchat-space Langchain-Chatchat Backend upload_temp_docs path traversal (medium 5.3)
- [CVE-2025-6855](https://insights.sbomify.com/CVE-2025-6855/): chatchat-space Langchain-Chatchat file path traversal (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6854 and fix it if it is affected.

What it is: CVE-2025-6854 is a medium-severity path traversal vulnerability in chatchat-space Langchain-Chatchat, published on 29 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6854 exists.

Affected packages and fixed versions:
- langchain-chatchat (PyPI): affected all versions up to 0.3.1; no fix listed
- langchain-chatchat (PyPI): affected all versions up to 0.3.1; no fix listed
- langchain-chatchat (PyPI): affected all versions up to 0.3.1; no fix listed

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-2025-6854/ (Markdown: https://insights.sbomify.com/CVE-2025-6854/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6854
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6854
- OSV: https://osv.dev/vulnerability/CVE-2025-6854

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6854/
Summaries are generated and may contain mistakes; the official description above is the record.