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Security Advisories

CVE-2026-45134

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-45134

Severity

7.1

High

CVSS V3

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Summary

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

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-45134
  • https://github.com/advisories/GHSA-3644-q5cj-c5c7
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45134.json
  • https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-3644-q5cj-c5c7

Affected packages

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