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Description

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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-06 | Updated 2026-04-13 | Assigner VulnCheck




HIGH: 8.4CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

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

Product status

Default status
unknown

Any version
affected

Default status
unknown

Any version
affected

Credits

Francesco Cipollone finder

References

phoenix.security/...-code-cli-allow-credential-exfiltration/ technical-description exploit

www.vulncheck.com/...s-command-injection-via-prompteditor-ts third-party-advisory

cve.org (CVE-2026-35021)

nvd.nist.gov (CVE-2026-35021)

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