CVE-2026-75128

CRITICAL 9.8

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

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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).

CWE	CWE-306
Vendor	chatchat-space
Product	langchain-chatchat
Published	Oct 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

chatchat-space / Langchain-Chatchat

0 ≤ 0.3.1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

lasso.security: https://www.lasso.security/vulnerability-database/cve-2026-75128 github.com: https://github.com/chatchat-space/Langchain-Chatchat/blob/a6a9193b5002061719f0eee62c6310bd5b1b7f63/libs/chatchat-server/chatchat/server/api_server/tool_routes.py#L33 vulncheck.com: https://www.vulncheck.com/advisories/langchain-chatchat-through-0.3.1.3-unauthenticated-rce-via-tools-call-endpoint

Credits

Noy Pearl Michael Sromin Ophir Dror