{"id":"CVE-2026-118667","summary":"LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests","details":"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.","aliases":["GHSA-3fx2-cqw9-xr3c"],"modified":"2026-10-29T10:45:55.265166281Z","published":"2026-10-28T20:51:46.657Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118667.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-22"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118667.json"},{"type":"FIX","url":"https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e"},{"type":"FIX","url":"https://github.com/langchain-ai/langgraph/pull/9213"},{"type":"WEB","url":"https://github.com/langchain-ai/langgraph/releases/tag/1.2.14"},{"type":"WEB","url":"https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6"},{"type":"ADVISORY","url":"https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118667"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/langchain-ai/langgraph","events":[{"introduced":"83dd61feaca993d2ee428706ad04c869895ce400"},{"fixed":"70dd64065bffaa3b6ab61a33f1f020fb54db8efa"},{"introduced":"c7792608e3681e46bfb27555cd2ab22b57408515"},{"fixed":"55b0e36c51d2922b11640b980fcfca1064243a96"},{"fixed":"d89c7e100ec6fc1512544d23b0a7c5169699ef3e"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"1.2.3"},{"fixed":"1.2.14"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"introduced":"0.4.0"},{"fixed":"0.4.6"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"d89c7e100ec6fc1512544d23b0a7c5169699ef3e"}],"source":"REFERENCES_COMMIT"},{"original_tag":"1.2.14","range":[{"fixed":"70dd64065bffaa3b6ab61a33f1f020fb54db8efa"}],"source":"REFERENCES_TAG"},{"source":"REFERENCES_TAG","original_tag":"sdk==0.4.6","range":[{"fixed":"55b0e36c51d2922b11640b980fcfca1064243a96"}]}]}}],"versions":["1.2.13","cli==0.4.32","sdk==0.4.5","1.2.12","sdk==0.4.4","sdk==0.4.3","1.2.11","checkpointpostgres==3.1.2","checkpoint==4.2.0","checkpointsqlite==3.1.1","checkpointpostgres==3.1.1","1.2.10","cli==0.4.31","1.2.9","1.2.8","1.2.7","1.2.6","cli==0.4.30","1.2.5","cli==0.4.29","cli==0.4.28","1.2.4","1.2.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118667.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}