# CVE-2026-46406

## Summary

- **CVE ID:** CVE-2026-46406
- **Severity:** MEDIUM
- **CVSS Score:** 4.4 (CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-59, CWE-200, CWE-377
- **Published:** Jun 29, 2026
- **Last Modified:** Jun 29, 2026

## Description

Claude Code is an agentic coding tool.  From 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file was created world-readable (0644) in a world-traversable directory (0755), allowing any local user to read a privileged user's Claude response, which could contain secrets or credentials. Additionally, because the path was static and predictable, a local attacker could pre-create the directory and plant a symlink at the expected file path, causing the privileged process to follow the symlink and overwrite an attacker-chosen file with the response text. Exploiting this required a local unprivileged user on the same system and a privileged user to run the /copy command. This vulnerability is fixed in 2.1.128.

## Affected Products

- anthropics — claude-code (>= 2.1.59, < 2.1.128)

## References

- [CNA](https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._