Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck

CVE-2026-75128Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpoint

Critical 9.8

In plain English

A critical-severity missing authentication in Langchain-Chatchat from chatchat-space. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)2.2%top 17.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Nuclei

Official 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).

Affected products (as reported)

Vendor	Product	Versions
chatchat-space	Langchain-Chatchat	0 – through 0.3.1.3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Lasso.security Advisory technical-description, exploit
https://github.com/chatchat-space/Langchain-Chatchat/blob/a6a9193b5002061719f0eee62c6310bd5b1b7f63/libs/chatchat-server/chatchat/server/api_server/tool_routes.py#L33 technical-description
VulnCheck Advisory: Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpoint third-party-advisory