CVE-2026-88968

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-59 CWE-367
Vendor	anthropics
Product	claude-code
Published	Nov 3, 2026

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Affected Versions

anthropics / claude-code

< 2.1.251

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/anthropics/claude-code/security/advisories/GHSA-5xjx-9qx6-jcrv github.com: https://github.com/anthropics/claude-code/releases/tag/v2.1.251