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

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 published
3 Nov 2026 20:08:47 UTC
Source modified
3 Nov 2026 21:29:17 UTC
Saved here
3 Nov 2026 22:57:17 UTC
Source terms
CVE Program Terms of Use

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

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 7.7 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

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