CVE-2026-25723

Claude Code Vulnerable to Command Injection via Piped sed Command Bypasses File Write Restrictions

State: Published
Severity: 7.7 High
Published: Feb 6, 2026
Updated: Feb 6, 2026
Reserved: Feb 5, 2026

Description

Claude Code is an agentic coding tool. Prior to version 2.0.55, Claude Code failed to properly validate commands using piped sed operations with the echo command, allowing attackers to bypass file write restrictions. This vulnerability enabled writing to sensitive directories like the .claude folder and paths outside the project scope. Exploiting this required the ability to execute commands through Claude Code with the "accept edits" feature enabled. This issue has been patched in version 2.0.55.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-20 Improper Input Validation
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
claude-codeanthropics	< 2.0.55Affected

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-mhg7-666j-cqg4

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