Medium 4.3Published Oct 28, 2026

CVE-2026-118667LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests

Updated under an hour ago (Oct 28, 2026, 11:20 PM ET)

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It affects langchain-ai langgraph and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for langchain-ai langgraph

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Received
Record last updated: Oct 28, 2026
First seen by InfoSec Signals: Oct 28, 2026

Affected products

Affected products

langchain-ai langgraph langchain_ai:langgraph (from the name)	from 1.2.3, < 1.2.14	CNA record
langchain-ai langgraph-sdk langchain_ai:langgraph_sdk (from the name)	from 0.4.0, < 0.4.6	CNA record

References

References

https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c	x-refsource-confirm
https://github.com/langchain-ai/langgraph/pull/9213	x-refsource-misc
https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e	x-refsource-misc
https://github.com/langchain-ai/langgraph/releases/tag/1.2.14	x-refsource-misc
https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.