CVE-2026-46406

[Catalogue CVE]

A flaw was found in Claude Code. The /copy command created responses in a predictable, world-readable temporary file without proper isolation or symlink protection. This allowed a local unprivileged user to read sensitive information from a privileged user's Claude response, potentially containing secrets or credentials. Additionally, an attacker could exploit this by planting a symlink to overwrite an arbitrary file with the response text. @anthropic-ai/claude-code: Claude Code: Information disclosure and file overwrite via insecure temporary file in /copy command Red Hat rates this Moderate with a CVSS score of 6.8, higher than NIST's 6.1. The difference is in the confidentiality and integrity metrics. Claude Code responses might contain secrets, API keys, credentials, and code, which is why Red Hat scores confidentiality as High rather than Low. On integrity, the symlink attack lets an unprivileged user redirect the write to any file the privileged process can touch — SSH authorized_keys, shell configs, application credentials. That can translate directly to privilege escalation, and Red Hat scores accordingly. Exploitation requires a local account on the same system as the privileged user, who must also run the /copy command. The only Red Hat product shipping a vulnerable version is OpenShift Lightspeed (ships 2.1.123). Red Hat Dev Spaces ships 2.1.138 and is not affected. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Gravité

Medium · CVSS 6.8CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

Published

Jun 29, 2026, 2:03:14 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.15% · Oct 29, 2026

{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "claude_code",
      "fixed_version": "2.1.128",
      "applicability_unknown": true
    },
    {
      "name": "claude_code",
      "ranges": [
        {
          "fixed": "2.1.128",
          "introduced": "2.1.58",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46406",
      "fixed_version": "2.1.128",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2026-46406",
      "provider_updated_at": "2026-10-25T21:10:00.770"
    }
  ]
}