---
title: "CVE-2026-51883: Langchain-Chatchat - Path Traversal"
description: "Langchain-Chatchat 0.3.0;0.3.1 contains a path traversal caused by injection of path traversal sequences in the knowledge_base_name parameter, letting attackers write files outside the knowledge base root directory, exploit requires crafted input."
url: https://panop.io/threat-heartbeat/CVE-2026-51883/
---

# CVE-2026-51883 Langchain-Chatchat - Path Traversal

Langchain-Chatchat 0.3.0;0.3.1 contains a path traversal caused by injection of path traversal sequences in the knowledge\_base\_name parameter, letting attackers write files outside the knowledge base root directory, exploit requires crafted input.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-51883)

## Details

Type

Path Traversal

Impact

Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

1 October 2026

Updated

15 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-51883](https://nvd.nist.gov/vuln/detail/CVE-2026-51883)
- [https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2](https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2)
- [https://github.com/chatchat-space/Langchain-Chatchat/issues/5467](https://github.com/chatchat-space/Langchain-Chatchat/issues/5467)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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