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

> CVE-2026-118667: LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-118667
Last updated: 2026-10-29T19:17:19Z

- Published: 2026-10-28 20:51 UTC · Updated: 2026-10-29 19:17 UTC · Assigner: GitHub\_M
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.39%, 34th percentile (scored 2026-11-03)
- CISA KEV: no
- CWE: CWE-22

## Description

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.

## Affected vendors and products

- langchain-ai: langgraph
- langchain-ai: langgraph-sdk

## Tracked companies

- [LangChain (LangSmith)](https://rewindex.com/company/langchain-langsmith.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-118667)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-118667)
- [https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e](https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e)
- [https://github.com/langchain-ai/langgraph/pull/9213](https://github.com/langchain-ai/langgraph/pull/9213)
- [https://github.com/langchain-ai/langgraph/releases/tag/1.2.14](https://github.com/langchain-ai/langgraph/releases/tag/1.2.14)
- [https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6](https://github.com/langchain-ai/langgraph/releases/tag/sdk%253D%253D0.4.6)
- [https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c](https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-118667 · Markdown: https://rewindex.com/cve/CVE-2026-118667.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-118667 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T14:26:16.370Z