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Tool Directory

CVE-2025-65099

HighPublished

Claude Code vulnerable to command execution prior to startup trust dialog

Published: Nov 19, 2025
Updated: Nov 20, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 6, 2026

Primary CVSS

7.7/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 42.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Claude Code is an agentic coding tool. Prior to version 1.0.39, when running on a machine with Yarn 3.0 or above, Claude Code could have been tricked to execute code contained in a project via yarn plugins before the user accepted the startup trust dialog. Exploiting this would have required a user to start Claude Code in an untrusted directory and to be using Yarn 3.0 or above. This issue has been patched in version 1.0.39.

Sources

cve-2025-65099PoC
Proof-of-concept exploit for CVE-2025-65099 in Claude Code, demonstrating yarnPath and plugin techniques to achieve code execution in a controlled environment.

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