CVE-2026-46406
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.4
- CVSS vector
- 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
- EPSS probability
- 0.15%
- CWE
- CWE-59, CWE-200, CWE-377
- Published
- 2026-06-29
- Last modified
- 2026-06-29
Affected products
- anthropics claude-code
Weakness type
Related vulnerabilities
- CVE-2026-88016 — rclone: Directory metadata (chmod/chown/chtimes) applied through a planted symlink in rclone local --links escapes the destination
- CVE-2026-88265 — Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
- CVE-2026-88264 — Crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs
- CVE-2026-87766 — Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
- CVE-2026-78622 — Improper Link Resolution in Okta Verify for Windows Uninstaller Data Removal
- CVE-2026-81963 — Windows Update Stack Elevation of Privilege Vulnerability
- CVE-2026-69425 — Windows NTFS Tampering Vulnerability
- CVE-2026-69289 — Windows Setup Files Cleanup Elevation of Privilege Vulnerability