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Vulnerability details

CVE-2026-45134

langchain-ai langsmith-sdk

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

CVSS 3.1
7.1High

Official 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.

CVSS scores

ScoreVersionSourceVector
7.1High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Affected products

VendorProductVersionsSource
langchain-ai langsmith-sdk < 0.6.0 CVEProject cvelistV5 (CNA)
langchain-ai langsmith-sdk < 0.8.0 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-05-27
Last updated
2026-06-02
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.19%
Probability of exploitation in 30 days
9.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-502
    Deserialization of Untrusted Data