What is CVE-2026-45134?

CVE-2026-45134 is a high-severity vulnerability in Langchain-ai Langsmith-sdk, classified under Deserialization of Untrusted Data. CVSS score: 7.1/10. Published 2026-05-27.

How severe is CVE-2026-45134?

High severity. CVSS v3 base score is 7.1 out of 10.

Deserialization in Langchain-ai Langsmith-sdk

CVE-2026-45134

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 / pullPro…

Vulnerability class: Insecure Deserialization

EPSS: 0.000 (11.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

Affected products

Langchain-ai Langsmith-sdk — versions < 0.8.0, < 0.6.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45134?: CVE-2026-45134 is a high-severity vulnerability in Langchain-ai Langsmith-sdk, classified under Deserialization of Untrusted Data. CVSS score: 7.1/10. Published 2026-05-27.
How severe is CVE-2026-45134?: High severity. CVSS v3 base score is 7.1 out of 10.