Claude Code vulnerable to command execution prior to startup trust dialog
Priority LOW 36CWE-94Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00545 45th percentileScored 2026-11-07
Fix Fixed claude-code (anthropics): 1.0.39@anthropic-ai/claude-code (npm): 1.0.39
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| anthropics | claude-code | before 1.0.39 | 1.0.39 | Patch available | CNA |
| — | @anthropic-ai/claude-code (npm) | before 1.0.39 | 1.0.39 | Patch available | GHSA-5hhx-v7f6-x7gv |
- claude-code Vendoranthropics Affected before 1.0.39 Fixed in 1.0.39 Patch available CNA
- @anthropic-ai/claude-code (npm) Vendor— Affected before 1.0.39 Fixed in 1.0.39 Patch available GHSA-5hhx-v7f6-x7gv
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:* | before 1.0.39 | Vulnerable | anthropics |
- cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:* Versions before 1.0.39 Vulnerable ·anthropics
Remediation
- Fix · CNA claude-code (anthropics) Fixed in 1.0.39
- Fix · GHSA-5hhx-v7f6-x7gv @anthropic-ai/claude-code (npm) Fixed in 1.0.39 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-65099
- 2026-10-03 Alias added: GHSA-5hhx-v7f6-x7gv
References
More anthropics Claude Code vulnerabilities
- TI-2025-40558 Claude Code Command Validation Bypass Allows Arbitrary Code Execution CVSS 4.0HIGH 8.7
- TI-2025-36683 Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email CVSS 4.0HIGH 8.7
- TI-2025-37066 Claude Code's startup trust dialog could lead to Command Execution attack CVSS 4.0HIGH 8.7
- TI-2026-17554 Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation CVSS 4.0MEDIUM 5.3
- TI-2025-40093 @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes CVSS 4.0HIGH 8.7
- TI-2025-36422 Claude Code rg command had Command Injection that allowed bypass of user approval prompt for command execution CVSS 4.0HIGH 8.7
Sources
- CVE-2025-65099 · CVE Program
- CVE-2025-65099 · NVD
- FIRST EPSS
- GHSA-5hhx-v7f6-x7gv · GitHub Advisory Database · CC BY 4.0
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