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

Quick assessment

Affected
anthropics claude-code
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

anthropics claude-code是anthropics的AI辅助编程工具。 Anthropic Claude Code 2.1.59版本至2.1.128之前版本存在安全漏洞，该漏洞源于/claude/copy命令将响应写入硬编码的可预测路径，未进行UID隔离、随机性或符号链接保护，可能导致本地普通用户读取特权用户的响应内容，且本地攻击者可预先创建目录并放置符号链接，使进程覆盖攻击者选择的文件。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.15% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
anthropics claude-code >= 2.1.59, < 2.1.128 affected
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I. Basic Information for CVE-2026-46406

Vulnerability Information
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Vulnerability Title
Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Anthropic Claude Code 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
anthropics claude-code是anthropics的AI辅助编程工具。 Anthropic Claude Code 2.1.59版本至2.1.128之前版本存在安全漏洞，该漏洞源于/claude/copy命令将响应写入硬编码的可预测路径，未进行UID隔离、随机性或符号链接保护，可能导致本地普通用户读取特权用户的响应内容，且本地攻击者可预先创建目录并放置符号链接，使进程覆盖攻击者选择的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
anthropics claude-code >= 2.1.59, < 2.1.128 -

II. Public POCs for CVE-2026-46406

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III. Intelligence Information for CVE-2026-46406

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Vendor Advisories for CVE-2026-46406 (1)

IV. Related Vulnerabilities

Same product: claude-code
Same vendor: anthropics
Same weakness: CWE-59

V. Comments for CVE-2026-46406

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