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CVE-2026-88968

Claude Code: TOCTOU Race in Edit Tool Allows File Writes Outside the Workspace

CVSS 4.0 7.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 3 Nov 2026 22:57:17 UTC. Read the latest advisory.

cve-program · CVE-2026-88968

Published

Claude Code is an agentic coding tool. Prior to 2.1.251, the Edit tool validates a target using pathname and symlink resolution that is not bound to the underlying directory inode or file descriptor. On macOS, attacker-controlled code running in the Bash sandbox can atomically replace an in-workspace parent directory with a symlink after validation, causing the unsandboxed Edit implementation to overwrite a user-writable file outside the workspace. Exploitation requires attacker-controlled code to run inside the sandbox, such as from a malicious repository or dependency script. This issue is fixed in version 2.1.251.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-88968

Published

claude-code

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "anthropics",
                    "product": "claude-code",
                    "versions": [
                        {
                            "version": "< 2.1.251",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON