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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.3 / Impact : 4.7

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*

History

30 Jun 2026, 17:30

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.1
First Time		Anthropic Anthropic claude Code
References	~~() https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2 -~~	() https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2 - Vendor Advisory
CPE		cpe:2.3:a:anthropic:claude_code::::::node.js::*

29 Jun 2026, 15:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-29 15:16

Updated : 2026-06-30 17:30

NVD link : CVE-2026-46406

Mitre link : CVE-2026-46406

CVE.ORG link : CVE-2026-46406

JSON object : View

Products Affected

anthropic

claude_code

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-377

Insecure Temporary File

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