Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
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 inco… https://www.cve.org/CVERecord?id=CVE-2026-40190
Post summary
The post announces CVE-2026-40190, indicating a vulnerable version of the LangSmith JavaScript/TypeScript SDK, but provides no additional technical, exploit, or mitigation details.
CVE-2026-40190 Prototype Pollution in LangSmith JavaScript SDK via Constructor Prototype Traversal https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40190
Post summary
A prototype‑pollution vulnerability (CVE-2026-40190) affecting the LangSmith JavaScript SDK has been reported, but no PoC, exploit, patch, or evidence of active exploitation is provided.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | langchain | langsmith | - | node.js | - |