Security Advisory

CVE-2026-40190

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-10 19:47:57

Last updated 2026-04-13 16:13:45

Assigner GitHub_M

State PUBLISHED

Description

LangSmith Client SDKs provide SDKs for interacting with the LangSmith platform. Prior to 0.5.18, the LangSmith JavaScript/TypeScript SDK (langsmith) contains an incomplete prototype pollution fix in its internally vendored lodash set() utility. The baseAssignValue() function only guards against the __proto__ key, but fails to prevent traversal via constructor.prototype. This allows an attacker who controls keys in data processed by the createAnonymizer() API to pollute Object.prototype, affecting all objects in the Node.js process. This vulnerability is fixed in 0.5.18.

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