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OpenAdvisories
High · 7.6 CVE-2026-104873 EUVD-2026-91794GHSA-fvww-7h3r-vfhpPYSEC-2026-4240

LangGraph SDK custom auth silently ignores actions= on resource decorators

Published Oct 2, 2026 · Updated Oct 5, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
langchain-ai langgraph >= 0.1.45, < 0.4.4 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
openSUSE Tumbleweed python-langgraph-sdk 0.4.9-1.1 openSUSE-SU-2026:12279-1

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI langgraph-sdk >= 0.1.45, < 0.4.4 0.4.4 GHSA-fvww-7h3r-vfhp

Advisories 1

References