CVE-2026-45134

A flaw was found in the LangSmith Client SDKs. This vulnerability allows an external attacker to control the content of prompt manifests when a user pulls a public prompt from the LangSmith Hub. By exploiting the deserialization of untrusted data, an attacker could achieve high confidentiality...

LangSmith SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning

DescriptionThe LangSmith SDK's prompt pull methods pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtime...

LangSmith SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning

DescriptionThe LangSmith SDK's prompt pull methods pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtime...

LangSmith SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning

DescriptionThe LangSmith SDK's prompt pull methods pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtime...

PT-2026-59212

Description The LangSmith SDK's prompt pull methods pull prompt / pull prompt commit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtim...

PT-2026-59217

Description The LangSmith SDK's prompt pull methods pull prompt / pull prompt commit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtim...

CVE-2026-45134

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to LangSmith SDK Python 0.8.0 and JS/TS 0.6.0, the LangSmith SDK's prompt pull methods pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from...

EUVD-2026-32640

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to LangSmith SDK Python 0.8.0 and JS/TS 0.6.0, the LangSmith SDK's prompt pull methods pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS fetch and deserialize prompt manifests from...

Deserialization of Untrusted Data

Overview langchain is a Building applications with LLMs through composability 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...

Deserialization of Untrusted Data

Overview 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 co...

Deserialization of Untrusted Data

Overview 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 co...

Deserialization of Untrusted Data

Overview langchain-classic is a Building applications with LLMs through composability 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...

PT-2026-40723

Name of the Vulnerable Software and Affected Versions LangSmith SDK Python versions prior to 0.8.0 LangSmith SDK JS/TS versions prior to 0.6.0 Description The prompt pull methods pull prompt and pull prompt commit in Python, and pullPrompt and pullPromptCommit in JS/TS, fetch and deserialize prom...