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CVE-2026-45134— LangSmith Client SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning

Quick assessment

Affected
langchain-ai langsmith-sdk
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangSmith Client SDKs是LangChain开源的一个开发者工具包。 LangSmith Client SDKs 0.8.0之前版本和JS/TS 0.6.0之前版本存在代码问题漏洞，该漏洞源于提示拉取方法未区分公共提示与组织内提示，可能导致反序列化外部控制的清单内容影响运行时行为。

CVSS 7.1 · High EPSS 0.34% · P25

Affected Version Matrix 2

VendorProduct Version RangeStatus
langchain-ai langsmith-sdk < 0.8.0 affected
< 0.6.0 affected
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I. Basic Information for CVE-2026-45134

Vulnerability Information
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Vulnerability Title
LangSmith Client SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning
Source: CVE Program / CVE List V5
Vulnerability Description
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 (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 runtime behavior. When pulling a public prompt by owner/name identifier, the manifest content is controlled by an external party, but prior versions of the SDK did not distinguish this from pulling a prompt within the caller's own organization. This vulnerability is fixed in LangSmith SDK Python 0.8.0 and JS/TS 0.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
LangSmith Client SDKs 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangSmith Client SDKs是LangChain开源的一个开发者工具包。 LangSmith Client SDKs 0.8.0之前版本和JS/TS 0.6.0之前版本存在代码问题漏洞，该漏洞源于提示拉取方法未区分公共提示与组织内提示，可能导致反序列化外部控制的清单内容影响运行时行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langsmith-sdk < 0.8.0 -

II. Public POCs for CVE-2026-45134

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10235 chars
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III. Intelligence Information for CVE-2026-45134

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Vendor Advisories for CVE-2026-45134 (1)

IV. Related Vulnerabilities

Same product: langsmith-sdk
Same vendor: langchain-ai
Same weakness: CWE-502

V. Comments for CVE-2026-45134

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