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

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

https://cvefeed.io/rssfeed/latest.atom / Wed, 05/27/2026 - 23:25
CVE ID :CVE-2026-45134
Published : May 27, 2026, 8:16 p.m. | 44 minutes ago
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.
Severity: 7.1 | HIGH
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