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EUVD-2026-290899

fkie_cve-2026-40190

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 __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.

GHSA-fw9q-39r9-c252 — LangSmith Client SDKs has Prototype Pollution in langsmith-sdk via Incomplete `proto` Guard in Internal lodash `set…

Affected: npm: langsmith

# GHSA-fw9q-39r9-c252: Prototype Pollution via Incomplete Lodash `set()` Guard in `langsmith-sdk`

**Severity:** Medium (CVSS ~5.6) **Status:** Fixed in 0.5.18

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## Summary

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.

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## Affected Products

| Product | Affected Versions | Component | |---------|-------------------|-----------| | `langsmith` (npm) | <= 0.5.17 | `js/src/utils/lodash/baseAssignValue.ts`, `js/src/anonymizer/index.ts` | | langchain-ai/langsmith-sdk | GitHub main branch (as of 2026-03-24) | JS/TypeScript SDK |

**Not affected:** The Python SDK (`langsmith` on PyPI) does not use lodash or an equivalent pattern.

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## Root Cause

The SDK vendors an internal copy of lodash's `set()` function at `js/src/utils/lodash/`. The `baseAssignValue()` function at `baseAssignValue.ts:11` implements a guard for prototype pollution:

```typescript function baseAssignValue(object: Record<string, any>, key: string, value: any) { if (key === "__proto__") { Object.defineProperty(object, key, { configurable: true, enumerable: true, value: value, writable: tr…

openSUSE-SU-2026:11284-1 — python313-langsmith-0.10.3-1.1 on GA media

python313-langsmith-0.10.3-1.1 on GA media

WID-SEC-W-2026-3046 — IBM Concert: Mehrere Schwachstellen