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CVE-2026-88968— Claude Code: TOCTOU Race in Edit Tool Allows File Writes Outside the Workspace

Quick assessment

Affected
anthropics claude-code
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Claude Code 是一款智能编程工具。在 2.1.251 版本之前，其 Edit 工具在验证目标时，仅通过路径名和符号链接解析进行校验，而未绑定到底层目录的 inode 或文件描述符。在 macOS 系统上，攻击者控制的代码若运行于 Bash 沙箱中，可在验证完成后原子性地用符号链接替换工作区内的父目录，从而导致未沙箱化的 Edit 实现覆盖工作区外的用户可写文件。利用此漏洞需要攻击者控制的代码在沙箱内执行，例如通过恶意仓库或依赖脚本触发。该问题已在 2.1.251 版本中修复。

CVSS 7.7 · High EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
anthropics claude-code < 2.1.251 affected
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I. Basic Information for CVE-2026-88968

Vulnerability Information
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Vulnerability Title
Claude Code: TOCTOU Race in Edit Tool Allows File Writes Outside the Workspace
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
anthropics claude-code < 2.1.251 -

II. Public POCs for CVE-2026-88968

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III. Intelligence Information for CVE-2026-88968

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Other References for CVE-2026-88968 (2)

IV. Related Vulnerabilities

Same product: claude-code
Same vendor: anthropics
Same weakness: CWE-59