CVE-2026-35021

published 2026-04-06

CVE-2026-35021: Anthropic Claude Code CLI and Claude Agent SDK contain an OS command injection vulnerability in the prompt editor invocation utility that allows attackers to…

Priority P3 41 high 8.4 CVSS 4.0

AV L AC L AT N PR N UI A VC H VI H VA H SC N SI N SA N E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

Anthropic Claude Code CLI and Claude Agent SDK contain an OS command injection vulnerability in the prompt editor invocation utility that allows attackers to execute arbitrary commands by crafting malicious file paths. Attackers can inject shell metacharacters such as $() or backtick expressions into file paths that are interpolated into shell commands executed via execSync. Although the file path is wrapped in double quotes, POSIX shell semantics (POSIX §2.2.3) do not prevent command substitution within double quotes, allowing injected expressions to be evaluated and resulting in arbitrary command execution with the privileges of the user running the CLI.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
anthropic	claude_agent_sdk	<= 0.1.55	—
anthropic	claude_agent_sdk_for_python	<= 0.1.55	—
anthropic	claude_code	<= 2.1.91	—
anthropic	claude_code	<= 2.1.91	—

CVSS provenance

nvd v4.0 8.4 HIGH CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

cvelistv5 8.4 HIGH

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CWE-78