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).
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/chatchat-space/Langchain-Chatchat/blob/a6a9193b5002061719f0e…
disclosure@vulncheck.com
https://www.lasso.security/vulnerability-database/cve-2026-75128
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/langchain-chatchat-through-0.3.1.3-unauthe…
disclosure@vulncheck.com