@anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes

CRITICAL 9.8CVE-2025-64755 · GHSA-7mv8-j34q-vp7q · Published 21/11/2025 · updated 18/10/2026

Package	Affected versions	Patched versions
claude code anthropic	`< 2.0.31`	`2.0.31`
@anthropic-ai/claude-code npm	`< 2.0.31`	`2.0.31`

Description

Due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system.

Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.

Thank you to Adam Chester - SpecterOps for reporting this issue!

NVD description

Claude Code is an agentic coding tool. Prior to version 2.0.31, due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system. This issue has been patched in version 2.0.31.

References

anthropics/claude-code security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2025-64755 · ADVISORY
anthropics/claude-code · PACKAGE

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