Prototype Pollution

LangSmith is vulnerable to Prototype Pollution. The vulnerability is due to an incomplete prototype pollution fix in its internally vendored lodash set utility, where the baseAssignValue function only guards against the proto key, but fails to prevent traversal via constructor.prototype, and...

CVE-2026-40190 LangSmith Client SDKs has Prototype Pollution in langsmith-sdk via Incomplete `__proto__` Guard in Internal lodash `set()`

LangSmith Client SDKs provide SDK's 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...

PT-2026-32040

Name of the Vulnerable Software and Affected Versions LangSmith versions prior to 0.5.18 Description The LangSmith JavaScript/TypeScript SDK langsmith contained an incomplete prototype pollution fix in its internally vendored lodash set utility. The baseAssignValue function only guarded against t...