CVE-2026-51883

Published Oct 1, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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

Type Values Removed Values Added
Title Path Traversal in Langchain‑Chatchat Knowledge Base Creation and Upload
Weaknesses CWE-22
Type Values Removed Values Added
First Time appeared Chatchat-space
Chatchat-space langchain-chatchat
Vendors & Products Chatchat-space
Chatchat-space langchain-chatchat
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
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 5, 2026, 6:36 PM
Reserved
Jun 8, 2026, 12:00 AM
Status
Deferred
Published
Oct 1, 2026, 10:17 PM
Modified
Oct 5, 2026, 7:17 PM