Is langsmith affected by CVE-2026-40190?

npm langsmith is affected in <0.5.18.

Is CVE-2026-40190 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-40190

Q: Is CVE-2026-40190 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

npm · langsmith

Summary

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

Severity: medium
EPSS: 0.2% (p14)
Also known as: GHSA-fw9q-39r9-c252
Published: 2026-04-10

References

https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-fw9q-39r9-c252
https://nvd.nist.gov/vuln/detail/CVE-2026-40190
https://github.com/langchain-ai/langsmith-sdk/pull/2690

Related advisories

CVE-2026-45134 — high · PyPI/langsmith
CVE-2026-41182 — medium · PyPI/langsmith
CVE-2026-25528 — medium · PyPI/langsmith

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.