LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.
History

Mon, 05 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 03 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-430
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

threat_severity

Important


Fri, 02 Oct 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Langchain-ai
Langchain-ai langgraph
Vendors & Products Langchain-ai
Langchain-ai langgraph

Fri, 02 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
Description LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.
Title LangGraph SDK custom auth silently ignores actions= on resource decorators
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-02T20:06:07.090Z

Updated: 2026-10-05T15:32:10.019Z

Reserved: 2026-10-02T14:59:11.775Z

Link: CVE-2026-104873

cve-icon Vulnrichment

Updated: 2026-10-05T14:46:59.597Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-02T20:17:01.223

Modified: 2026-10-06T15:08:38.397

Link: CVE-2026-104873

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-02T20:06:07Z

Links: CVE-2026-104873 - Bugzilla