Access of Resource Using Incompatible Type ('Type Confusion') Affecting langsmith package, versions [,0.8.18)
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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- published21 Jun 2026
- disclosed19 Jun 2026
- creditRyu7z
Introduced: 19 Jun 2026
CVE-2026-59152 (opens in a new tab)How to fix?
Upgrade langsmith to version 0.8.18 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 Access of Resource Using Incompatible Type ('Type Confusion') via the file attachments handling. An attacker can access local files on the server and have their contents uploaded to an external service by sending crafted HTTP requests that manipulate tracing-propagation headers.
Note: This is only exploitable if the attacker can send HTTP requests to the server and has read access to the workspace where traces are stored.
Workaround
This vulnerability can be mitigated by not exposing TracingMiddleware to untrusted HTTP traffic and limiting workspace trace-read access to trusted members.