Anthropic Claude Code up to 2.1.250 Edit Tool toctou

Summaryinfo

A vulnerability described as critical has been identified in Anthropic Claude Code up to 2.1.250. This issue affects some unknown processing of the component Edit Tool. Such manipulation leads to toctou. This vulnerability is referenced as CVE-2026-88968. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Anthropic Claude Code up to 2.1.250 and classified as critical. Affected by this issue is an unknown code block of the component Edit Tool. The manipulation with an unknown input leads to a toctou vulnerability. Using CWE to declare the problem leads to CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-88968 since 09/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 2.1.251 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Anthropic

Name

• Claude Code

Version

• 2.1.250

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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