Is CVE-2026-45134 actively exploited?

No active exploitation of CVE-2026-45134 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45134 be exploited remotely?

Yes. CVE-2026-45134 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45134?

CVE-2026-45134 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-45134

CWE-502Published: May 27, 2026· Updated: May 29, 2026

7.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:10.2th

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.

NVD Source

Technical Analysis

CVE-2026-45134 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.1.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.