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Claude Code EUVDEUVD-2026-40117

| CVE-2026-55607 HIGH
Path Traversal (CWE-22)
2026-06-29 GitHub_M
Path Traversal RCE Claude Code
7.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.7 HIGH
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
vuln.today AI
8.3 HIGH

Malicious repo is network-delivered (AV:N) but needs symlink/fsmonitor chaining (AC:H) and the victim to clone and run the tool (UI:R); the sandbox escape changes scope (S:C) with full host code execution (C/I/A:H).

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Jun 29, 2026 - 16:01 EUVD
Analysis Generated
Jun 29, 2026 - 15:19 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Sandbox escape and code execution in Anthropic's Claude Code CLI (versions 2.1.38 through 2.1.162) lets a malicious repository break out of the macOS seatbelt sandbox by abusing git worktree handling. By creating a worktree named ".git" and combining symlink manipulation with git fsmonitor execution, an attacker can overwrite files in the user's home directory such as .zshenv to achieve code execution outside the sandbox. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Victim clones malicious repository
Delivery
Run Claude Code against repo
Exploit
Worktree named .git confuses git directory
Execution
fsmonitor executes with symlink redirection
Persist
Overwrite ~/.zshenv in home directory
Impact
Shell sources file, code runs outside sandbox
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to clone a malicious repository containing prompt-injection content and then run Claude Code (versions 2.1.38-2.1.162) against it; the repo must carry a git worktree named ".git" and rely on symlink manipulation plus git fsmonitor execution during worktree operations to redirect writes into the home directory (for example overwriting .zshenv). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H, base 7.7) signals network delivery with no authentication but with a present attack requirement (AT:P) and passive user interaction, which aligns with the description: the attacker needs no credentials, but the victim must clone a malicious repo and run Claude Code against it, and a prompt-injection/setup condition must hold. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker publishes an attractive open-source repository seeded with prompt-injection content and a crafted git worktree named ".git" plus malicious symlinks and fsmonitor configuration. A developer clones it and runs Claude Code against the project; during worktree operations git executes the attacker-controlled fsmonitor program and writes are redirected via symlinks to overwrite ~/.zshenv. …
Remediation Vendor-released patch: 2.1.163 - upgrade Claude Code to 2.1.163 or later, which fixes the worktree handling, per advisory GHSA-7835-87q9-rgvv (https://github.com/anthropics/claude-code/security/advisories/GHSA-7835-87q9-rgvv). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit installed Claude Code CLI versions across macOS endpoints to identify users on versions 2.1.38-2.1.162. …

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EUVD-2026-40117 vulnerability details – vuln.today
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