---
id: CVE-2026-104873
title: >-
  LangGraph Python SDK is used to connect to running LangGraph API servers,
  manage assistants, threads and stream runs from Python applications
summary: >-
  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.t…
severity: high
cvss: 7.6
cvssVector: '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'
cwe:
  - CWE-863
vendor: langchain-ai
product: langgraph
affected:
  - 'langgraph >= 0.1.45, < 0.4.4'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T20:17:01.223'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104873'
references:
  - url: >-
      https://github.com/langchain-ai/langgraph/commit/5a77be5e8bec1600ad0a865638d88c1368497559
    label: security-advisories@github.com
  - url: 'https://github.com/langchain-ai/langgraph/releases/tag/sdk==0.4.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fvww-7h3r-vfhp
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-02T22:33:09.843Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.