Deserialization of Untrusted Data Affecting langsmith package, versions <0.6.0

langsmith is a Client library to connect to the LangSmith Observability and Evaluation Platform.

Affected versions of this package are vulnerable to Deserialization of Untrusted Data when fetching and processing prompt manifests from external sources. An attacker can execute arbitrary code or manipulate application behavior by publishing a crafted prompt manifest that is deserialized without proper validation. This may lead to disclosure of sensitive information, redirection of outbound requests, or execution of attacker-supplied configuration.

Note:

This is only exploitable if the application pulls prompts by owner/name from untrusted or compromised accounts and uses the pulled prompt without independently validating its contents.

Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.

Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.

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