PT-2026-34593 · Langchain Ai · Langsmith-Sdk

Published 2026-04-23 · Updated 2026-04-23 · CVE-2026-41182

Mitre

CVSS v3.1

5.3

Medium

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to version 0.5.19 of the JavaScript SDK and version 0.7.31 of the Python SDK, the LangSmith SDK's output redaction controls (hideOutputs in JS, hide outputs in Python) do not apply to streaming token events. When an LLM run produces streaming output, each chunk is recorded as a new token event containing the raw token value. These events bypass the redaction pipeline entirely — prepareRunCreateOrUpdateInputs (JS) and hide run outputs (Python) only process the inputs and outputs fields on a run, never the events array. As a result, applications relying on output redaction to prevent sensitive LLM output from being stored in LangSmith will still leak the full streamed content via run events. Version 0.5.19 of the JavaScript SDK and version 0.7.31 of the Python SDK fix the issue.

Fix

Information Disclosure

Insertion into Log File

Weakness Enumeration

CWE-359

CWE-200

CWE-532

Related Identifiers

CVE-2026-41182

Affected Products

Langsmith-Sdk

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-41182 · Security Note
• https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-rr7j-v2q5-chgv · Note