CVE-2026-51883
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductLangchain-Chatchat
PublishedOct 1, 2026
First seenOct 1, 2026
Weakness typeCWE-22Path traversal
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Langchain-Chatchat | 0.3.0 ≤ v ≤ 0.3.1 | — |
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