Resource Management Flaw in LangGraph Python SDK by LangChain AI
CVE-2026-104873

7.6HIGH

Key Information:

Vendor

Langchain-ai

Status
Langgraph
Vendor
CVE Published:
2 October 2026

What is CVE-2026-104873?

The LangGraph Python SDK connects applications to LangGraph API servers and manages various resources, including assistants and threads. Versions from 0.1.45 to 0.4.3 contain an authorization flaw in the resource-scoped decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons. This issue arises when the actions argument is ignored, allowing unauthorized access to resources. An authenticated user can potentially read, update, or delete another user's data due to improper handling of resource actions. Protecting a deployment requires that selected handlers enforce the necessary permissions independently. The vulnerability has been addressed in version 0.4.4.

Affected Version(s)

langgraph >= 0.1.45, < 0.4.4

References

https://github.com/langchain-ai/langgraph/security/adviso...
x_refsource_CONFIRM
https://github.com/langchain-ai/langgraph/commit/5a77be5e...
x_refsource_MISC
https://github.com/langchain-ai/langgraph/releases/tag/sd...
x_refsource_MISC

CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.