Description
The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.
Published: 2026-10-01
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 06 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 05 Oct 2026 21:45:00 +0000

Type Values Removed Values Added
Title Path Traversal in Langchain‑Chatchat Knowledge Base Creation and Upload

Mon, 05 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}


Thu, 01 Oct 2026 23:45:00 +0000

Type Values Removed Values Added
Title Path Traversal in Langchain‑Chatchat Knowledge Base Creation and Upload
Weaknesses CWE-22

Thu, 01 Oct 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Chatchat-space
Chatchat-space langchain-chatchat
Vendors & Products Chatchat-space
Chatchat-space langchain-chatchat

Thu, 01 Oct 2026 21:45:00 +0000

Type Values Removed Values Added
Description The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.
References

Subscriptions

Chatchat-space Langchain-chatchat
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-05T18:36:38.045Z

Reserved: 2026-06-08T00:00:00.000Z

Link: CVE-2026-51883

cve-icon Vulnrichment

Updated: 2026-10-05T18:36:25.605Z

cve-icon NVD

Status : Deferred

Published: 2026-10-01T22:17:03.127

Modified: 2026-10-05T19:17:21.630

Link: CVE-2026-51883

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-05T21:30:19Z

Weaknesses