SB2026043048 - OS Command Injection in Claude Code

Description

This security bulletin contains information about 1 vulnerability.

1) OS Command Injection (CVE-ID: CVE-2025-54795)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists due to command injection in the echo command parser when processing untrusted content in a Claude Code context window. A remote attacker can add crafted untrusted content to bypass the confirmation prompt and execute arbitrary commands.

Reliable exploitation requires the ability to add untrusted content into a Claude Code context window.

Remediation

Install update from vendor's website.

References

• https://github.com/anthropics/claude-code/security/advisories/GHSA-x56v-x2h6-7j34
• https://github.com/advisories/GHSA-x56v-x2h6-7j34