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CVE-2026-118667

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • langgraph

    Versions
    • >= 1.2.3, < 1.2.14: Affected

    No fix published

  • langgraph-sdk

    Versions
    • >= 0.4.0, < 0.4.6: Affected

    No fix published

  • langgraph-sdk PyPI

    Versions
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.4.5
    Affected ranges
    • ECOSYSTEM: ≥ 0.4.0, < 0.4.6

    Update to 0.4.6

  • langgraph PyPI

    Versions
    • 1.2.10
    • 1.2.11
    • 1.2.12
    • 1.2.13
    • 1.2.3
    • 1.2.4
    • 1.2.5
    • 1.2.6
    • 1.2.7
    • 1.2.8
    • 1.2.9
    Affected ranges
    • ECOSYSTEM: ≥ 1.2.3, < 1.2.14

    Update to 1.2.14

Original sources

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