CVE-2026-118668 Details
Description
langgraph-api implements the LangGraph API for rapid development and testing. From 0.1.2 until 0.15.0, JavaScript or TypeScript custom authentication Store authorization handlers can return a rewritten namespace that is not carried across the runtime boundary and applied before the Store operation. An authenticated user can therefore access another user's Store namespace when a deployment relies on namespace rewriting for isolation, allowing unauthorized reads, overwrites, searches, or deletions. Python custom authentication and handlers that reject unauthorized namespaces instead of rewriting them are not affected. This issue is fixed in version 0.15.0.
A vulnerability in the Langgraph API's Store authorization process allows authenticated users to access Store data from other users' namespaces. This issue affects versions 0.1.2 prior to 0.15.0, specifically in JavaScript or TypeScript custom authentication handlers that rewrite namespace requests for authorization. The vulnerability arises because the rewritten namespaces are not properly applied before Store operations, leading to unauthorized access to data. In contrast, Python custom authentication handlers that reject unauthorized namespaces are not affected.
Users are advised to upgrade to Langgraph API version 0.15.0 or later, where this issue has been fixed. For deployments that cannot upgrade immediately, a workaround is to modify JavaScript or TypeScript Store authorization handlers to reject requests for unauthorized namespaces, rather than relying on namespace rewriting. This workaround must be applied to every Store action exposed by the deployment.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 28, 2026CISA-ADP
Assessed Oct 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/langchain-ai/langgraph/security/advisories/GHSA-4hm6-w6qq-w73v | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| langgraph-api | >= 0.1.2, < 0.15.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 29, 2026 | CVE Modified | CISA-ADP |
| Oct 28, 2026 | New CVE Received | [email protected] |