CVE-2026-55607: high-severity vulnerability in anthropics claude-code
Claude Code: Sandbox Escape via Git Worktree Path Confusion Allows Unsandboxed Code Execution
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 0.7%
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.
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
Affected products
anthropics · claude-codeRelated CVEs — anthropics claude-code
In the same product, most dangerous first.
CVE-2026-21852MEDIUMClaude Code Leaks Data via Malicious Environment Configuration Before Trust ConfirmationEPSS 27.5%CVE-2025-59536HIGHClaude Code's startup trust dialog could lead to Command Execution attackEPSS 24.9%CVE-2025-54794HIGHClaude Code Research Preview has a Path Restriction Bypass which could allow unauthorized file accessEPSS 1.5%CVE-2025-54795HIGHClaude Code echo command allowed bypass of user approval prompt for command executionEPSS 1.1%CVE-2025-66032HIGHClaude Code Command Validation Bypass Allows Arbitrary Code ExecutionEPSS 0.7%CVE-2026-39861HIGHClaude Code: Sandbox Escape via Symlink Following Allows Arbitrary File Write Outside WorkspaceEPSS 0.7%