CVE-2026-46406 - Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write

CVE-2026-46406 - Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write

https://cvefeed.io/rssfeed/latest.atom / Mon, 06/29/2026 - 19:02
CVE ID :CVE-2026-46406
Published : June 29, 2026, 2:03 p.m. | 2 hours, 39 minutes ago
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.
Severity: 0.0 | NA
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