LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118667
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 21:16:57 UTC
Updated2026-10-28 21:16:57 UTC
DescriptionLangGraph 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langchain-ai Langgraph affected >= 1.2.3, < 1.2.14 Not specified
CNA Langchain-ai Langgraph-sdk affected >= 0.4.0, < 0.4.6 Not specified

References

ReferenceSourceLinkTags
github.com/langchain-ai/langgraph/releases/tag/1.2.14 [email protected] github.com
github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c [email protected] github.com
github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c51... [email protected] github.com
github.com/langchain-ai/langgraph/pull/9213 [email protected] github.com
github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6 [email protected] github.com
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