CVE-2026-75128CWE-306

CVE-2026-75128

Critical · published October 20, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
43.5
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · 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
EPSS
0.00522 · 43.5th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-10-20T05:17Z
References (3)
https://www.lasso.security/vulnerability-database/cve-2026-75128 · [email protected]https://www.vulncheck.com/advisories/langchain-chatchat-through-0.3.1.3-unauthenticated-rce-via-tools-call-endpoint · [email protected]https://github.com/chatchat-space/Langchain-Chatchat/blob/a6a9193b5002061719f0eee62c6310bd5b1b7f63/libs/chatchat-server/chatchat/server/api_server/tool_routes.py#L33 · [email protected]
EPSS history
Timeline
  • 21 OCT 03:32Z
    EPSS moved — → 1%
    epss
  • 20 OCT 00:46Z
    Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpoint
    cvelistv5
  • 20 OCT 00:46Z
    Langchain-Chatchat through 0.3.1.3 Unauthenticated RCE via /tools/call Endpoint
    cvelistv5