Insertion of Sensitive Information into Log File Affecting langsmith package, versions <0.5.19
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-LANGSMITH-16082039
- published16 Apr 2026
- disclosed16 Apr 2026
- creditRyu7zz
Introduced: 16 Apr 2026
CVE-2026-41182 (opens in a new tab)How to fix?
Upgrade langsmith to version 0.5.19 or higher.
Overview
langsmith is a Client library to connect to the LangSmith Observability and Evaluation Platform.
Affected versions of this package are vulnerable to Insertion of Sensitive Information into Log File through the Client handling of events. An attacker can bypass redaction controls and exfiltrate LLM output by supplying streaming events with kwargs content that gets uploaded as part of a run. This leaks token-by-token model output into traced events, exposing prompt or response data to anyone with access to the stored run records.