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  4. CVE 2026 88968 claude code toctou race in edit tool allows file
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Back to active CVEs
High · CVSS 7.7CVE-2026-88968

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

Answer in brief

CVE-2026-88968 records a High severity (CVSS 7.7) vulnerability in Claude Code: TOCTOU Race in Edit Tool Allows File Writes Outside the Workspace. The current sources do not mark it as known exploited. The current feed maps anthropics/claude-code (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps anthropics/claude-code (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
anthropics/claude-codegeneric<2.1.2512.1.251

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for anthropics/claude-code.
  2. 2Review the reported fix. Update anthropics/claude-code to 2.1.251 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Claude Desktop: Uncontrolled Search Path Enables Arbitrary Code Execution via Malicious Git ExecutableSame anthropics/claude-code package
  • Terragrunt catalog predictable temp symlink clobberAlso CWE-59

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-59, CWE-367
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record