CVE catalog
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
- Severity
- Critical · CVSS 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.31% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | langsmith | Not reported | 0.5.18 | fixed |
| Opensuse | python-langsmith | tumbleweed | 0.10.3-1.1 | fixed |
| Cpe | langsmith | Not reported | 0.5.18 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | langsmith | cpe | Not reported | 0.5.18 | Not reported | Not reported | Not reported |
| Opensuse | python-langsmith | rpm | tumbleweed | 0.10.3-1.1 | Not reported | OPENSUSE-SU-2026:11284-1 | Not reported |
| Cpe | langsmith | cpe | Not reported | 0.5.18 | Not reported | NVD-CVE-2026-40190 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-langsmith]Unknown
Source package: [python-langsmith]
Details (1)
0.11.2-1.1· noarch · tumbleweedUnknown · Fixed:
0.10.3-1.1Version impact unknown
nvd · python-langsmith · opensuse · tumbleweed
- [python314-langsmith]Unknown
Source package: [python-langsmith]
Details (1)
0.11.2-1.1· noarch · tumbleweedUnknown · Fixed:
0.10.3-1.1Version impact unknown
nvd · python-langsmith · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11284-1.json]
- [https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-fw9q-39r9-c252]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-40190]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11284-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3046.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]