CVE-2026-75128
Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpoint
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 20, 2026
- Updated
- Oct 20, 2026
- Reserved
- Aug 17, 2026
Description
Langchain-Chatchat through 0.3.1.3 exposes a POST /tools/call API endpoint that invokes any registered tool by name without authentication, leaving the always-registered shell tool callable. Remote attackers can send a single request naming the shell tool to execute arbitrary OS commands as the server user (root in the shipped Docker image).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
Langchain-Chatchatchatchat-space |
|
References
- Lasso.security Advisorytechnical-descriptionexploit
- https://github.com/chatchat-space/Langchain-Chatchat/blob/a6a9193b5002061719f0eee62c6310bd5b1b7f63/libs/chatchat-server/chatchat/server/api_server/tool_routes.py#L33technical-description
- VulnCheck Advisory: Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpointthird-party-advisory
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