{"id":"CVE-2026-118667","title":"LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests","summary":"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 v…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-22"],"vendor":"langchain-ai","product":"langgraph","affected":["langgraph >= 1.2.3, < 1.2.14","langgraph-sdk >= 0.4.0, < 0.4.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-29T18:25:51.378346Z"},"published":"2026-10-28","updated":"2026-10-29","sourceUpdated":"2026-10-29T18:26:03.178Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118667","references":[{"url":"https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c","label":"https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c"},{"url":"https://github.com/langchain-ai/langgraph/pull/9213","label":"https://github.com/langchain-ai/langgraph/pull/9213"},{"url":"https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e","label":"https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e"},{"url":"https://github.com/langchain-ai/langgraph/releases/tag/1.2.14","label":"https://github.com/langchain-ai/langgraph/releases/tag/1.2.14"},{"url":"https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6","label":"https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6"},{"url":"https://github.com/advisories/GHSA-3fx2-cqw9-xr3c"},{"url":"https://github.com/langchain-ai/langgraph"}],"tags":["cve.org","ghsa","pip","osv"],"aliases":["GHSA-3fx2-cqw9-xr3c"],"ecosystem":"pip","patched":["langgraph-sdk 0.4.6","langgraph 1.2.14"],"epss":0.00394,"epssPercentile":0.33618,"ingestedAt":"2026-10-28T21:18:49.945Z","slug":"CVE-2026-118667","body":"## Overview\n\nLangGraph 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.\n\n## Affected\n\n- `langgraph >= 1.2.3, < 1.2.14`\n- `langgraph-sdk >= 0.4.0, < 0.4.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-118667)\n\nAffected packages:\n\n- `langgraph-sdk >= 0.4.0, < 0.4.6`\n- `langgraph >= 1.2.3, < 1.2.14`\n\nPatched in:\n\n- `langgraph-sdk 0.4.6`\n- `langgraph 1.2.14`\n\nSource: https://github.com/advisories/GHSA-3fx2-cqw9-xr3c","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}