| Component | LangGraph |
| Severity | medium (CVSS 5.9) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L |
| Published (NVD) | 2026-09-14 |
| Last modified | 2026-09-30 |
| Affected versions | < 0.10.0 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | 0.10.0 |
| Weakness | CWE-287 |
| CISA KEV | not listed |
NVD description
langgraph-api implements the LangGraph API for rapid development and testing. Prior to 0.10.0, langgraph-api permits a run or cron to specify a relative webhook target that is delivered through an in-process loopback transport, and the authentication middleware treats that transport as internal without applying the authentication context used for external requests. In deployments that rely on per-user authorization to separate threads and runs, an authenticated user can direct a webhook to the server's own thread and run routes, allowing creation of a run on or modification of another user's thread and limited incorporation of the targeted thread's metadata into the created run record. The affected path requires webhook targets and per-user authorization boundaries; deployments that deliberately re-enable loopback delivery should restrict it to controlled same-process routes because those webhooks remain unauthenticated. This issue is fixed in version 0.10.0.
What to do
- Upgrade LangGraph to
0.10.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-55235
- https://github.com/langchain-ai/docs/blob/7b70fbacab21f84d9c6f9848f86cdeb471adbb50/src/langsmith/agent-server-changelog.mdx
- https://github.com/langchain-ai/helm/security/advisories/GHSA-2c9q-c2q9-qgqv
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