Critical severity · published Nov 19, 2025
CVE-2025-65099
Claude Code vulnerable to command execution prior to startup trust dialog
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
claude-code · anthropics
< 1.0.39 · source: vendor
CC
Claude Code · Anthropic
before 1.0.39 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-65099
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-65099
Third Party Advisory
https://github.com/anthropics/claude-code/security/advisories/GHSA-5hhx-v7f6-x7gv
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