Bug 2563193 (CVE-2026-118667)

Summary:	CVE-2026-118667 langgraph-sdk: langgraph: LangGraph: Information disclosure via path traversal in streaming helpers
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anpicker, blitton, dfreiber, drow, dschmidt, hasun, jburrell, jfula, jlanda, jowilson, kshier, mbarnett, mhayden, nyancey, ometelka, ptisnovs, rbobbitt, rjohnson, sdoran, simaishi, stcannon, syedriko, vkumar, xdharmai, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in LangGraph. Helper functions responsible for streaming operations fail to properly sanitize caller-controlled identifiers before inserting them into authenticated request paths. An attacker can supply path traversal sequences within these identifiers to redirect requests to unintended endpoints on the server, potentially leading to unauthorized information disclosure.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-28 21:01:37 UTC

LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From langgraph-sdk 0.4.0 until 0.4.6, and from langgraph 1.2.3 until 1.2.14 when RemoteGraph v3 streaming uses an affected langgraph-sdk version, the synchronous and asynchronous v3 stream get_tree and _fetch_state helpers interpolate caller-controlled assistant_id and thread_id values into authenticated GET request paths without using _quote_path_param. Relative path segments can therefore be normalized into another readable path on the configured server while retaining authentication headers. This issue is fixed in langgraph-sdk 0.4.6 and langgraph 1.2.14.