GHSA-4vp2-6q8c-pvq2

Suggest an improvement
Source
https://github.com/advisories/GHSA-4vp2-6q8c-pvq2
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4vp2-6q8c-pvq2/GHSA-4vp2-6q8c-pvq2.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-4vp2-6q8c-pvq2
Aliases
Downstream
Published
2026-06-25T16:53:00Z
Modified
2026-07-09T05:15:09.237703561Z
Severity
  • 4.4 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
@anthropic-ai/claude-code has an Insecure Temporary File in /copy Command that Enables Response Disclosure and Symlink-Based File Write
Details

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.

Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.

Claude Code thanks hackerone.com/ch4ck0 for reporting this issue.

Database specific 
{
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-200",
        "CWE-377",
        "CWE-59"
    ],
    "severity": "MODERATE",
    "nvd_published_at": null,
    "github_reviewed_at": "2026-06-25T16:53:00Z"
}
References

Affected packages

npm / @anthropic-ai/claude-code

Package

Name
@anthropic-ai/claude-code
View open source insights on deps.dev
Purl
pkg:npm/%40anthropic-ai/claude-code

Affected ranges

Type
SEMVER
Events
Introduced
2.1.59
Fixed
2.1.128

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4vp2-6q8c-pvq2/GHSA-4vp2-6q8c-pvq2.json"