Anthropic Claude Code CLI and Claude Agent SDK contain an OS command injection vulnerability in the command lookup helper and deep-link terminal launcher that allows local attackers to execute arbitrary commands by manipulating the TERMINAL environment variable. Attackers can inject shell metacharacters into the TERMINAL variable which are interpreted by /bin/sh when the command lookup helper constructs and executes shell commands with shell=true. The vulnerability can be triggered during normal CLI execution as well as via the deep-link handler path, resulting in arbitrary command execution with the privileges of the user running the CLI.
History

Tue, 07 Apr 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Anthropic
Anthropic claude Agent Sdk For Python
Anthropic claude Code
Vendors & Products Anthropic
Anthropic claude Agent Sdk For Python
Anthropic claude Code

Tue, 07 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 06 Apr 2026 20:00:00 +0000

Type Values Removed Values Added
Description Anthropic Claude Code CLI and Claude Agent SDK contain an OS command injection vulnerability in the command lookup helper and deep-link terminal launcher that allows local attackers to execute arbitrary commands by manipulating the TERMINAL environment variable. Attackers can inject shell metacharacters into the TERMINAL variable which are interpreted by /bin/sh when the command lookup helper constructs and executes shell commands with shell=true. The vulnerability can be triggered during normal CLI execution as well as via the deep-link handler path, resulting in arbitrary command execution with the privileges of the user running the CLI.
Title Anthropic Claude Code & Agent SDK OS Command Injection via TERMINAL Environment Variable
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-04-06T18:58:40.513Z

Updated: 2026-04-06T20:22:29.141Z

Reserved: 2026-03-31T20:40:15.618Z

Link: CVE-2026-35020

cve-icon Vulnrichment

Updated: 2026-04-06T20:22:18.467Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-06T20:16:24.863

Modified: 2026-04-07T13:20:11.643

Link: CVE-2026-35020

cve-icon Redhat

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