CVE-2026-25723CWE-20CWE-78

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

High · published February 6, 2026

CVSS v4.0
7.7
EPSS
1%
Percentile
44.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.7 · HIGH
Vector
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
EPSS
0.00531 · 44.0th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-02-06T17:52Z
EPSS history
Timeline
  • 06 FEB 17:52Z
    Claude Code Vulnerable to Command Injection via Piped sed Command Bypasses File Write Restrictions
    cvelistv5