VDB
CVE-2026-40190
CVE-2026-40190
PUBLISHED
CVSS 5.599999904632568 MEDIUM
LangSmith Client SDKs has Prototype Pollution in langsmith-sdk via Incomplete `__proto__` Guard in Internal lodash `set()`
EPSS 0.02% · 4.7th percentile
Risk Scores
CVSS v3.1
5.599999904632568
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score
0.02%
4.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| langchain-ai | langsmith-sdk | < 0.5.18 |
| npm | langsmith | 0 |
Timeline
- Apr 10, 2026 CVE Published
- Apr 10, 2026 PoC Published
- Apr 11, 2026 EPSS Score
- Apr 11, 2026 Security Advisory
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
References
- https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-fw9q-39r9-c252 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-40190 advisory
- https://github.com/langchain-ai/langsmith-sdk/pull/2690 url
- https://github.com/langchain-ai/langsmith-sdk/commit/31d3c3aec02892f4312baae112f817d6b2f0ebe3 url
- https://github.com/langchain-ai/langsmith-sdk package