CVE-2026-55607
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk48th percentile — higher than 48% of all known CVEs
Summary
A vulnerability in Claude Code (versions 2.1.38 through 2.1.163) allows worktree manipulation attacks, including creating worktrees named ".git" and navigating outside the sandbox. An attacker can overwrite files in the user's home directory (e.g., .zshenv), leading to code execution outside seatbelt sandbox restrictions.
Risk Assessment
The risk involves remote code execution in the context of a user who clones a malicious repository and runs Claude Code. This could lead to account compromise and privilege escalation.
Recommendation
Immediately update Claude Code to version 2.1.163 or later. Avoid cloning and running the tool on repositories from untrusted sources.
Original NVD description (English source)
Claude Code is an agentic coding tool. From 2.1.38 until 2.1.163, Claude Code's worktree handling allowed creation of worktrees named ".git" and navigation to worktrees outside the sandbox context, enabling git directory confusion attacks. By exploiting symlink manipulation and git fsmonitor execution during worktree operations, an attacker could overwrite files in the user's home directory (such as .zshenv), leading to code execution outside of seatbelt sandbox restrictions. Reliably exploiting this required the user to clone a malicious repository containing prompt injection content and run Claude Code against it. This vulnerability is fixed in 2.1.163.