SB2026063041 - Insecure Temporary File in Claude Code
Published: June 30, 2026
Security Bulletin ID
SB2026063041
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Insecure Temporary File (CVE-ID: CVE-2026-46406)
CWE-ID: CWE-377 - Insecure Temporary File
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to insecure temporary file usage in the /copy command when writing response content to a predictable temporary file path. A local user can read the world-readable temporary file to disclose sensitive information.
Exploitation requires a privileged user on the same system to run the /copy command.
Remediation
Install update from vendor's website.