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Back to active CVEs
High · CVSS 7.7CVE-2026-103435

Arbitrary File Write via Write-Time Symlink Following (TOCTOU) in Claude CodeCVE-2026-103435

Answer in brief

CVE-2026-103435 records a High severity (CVSS 7.7) vulnerability in Arbitrary File Write via Write-Time Symlink Following (TOCTOU) in Claude Code. The current sources do not mark it as known exploited. The current feed maps Anthropic/@anthropic-ai/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 Oct 7, 2026Updated Oct 7, 2026Source checked Oct 7, 2026First seen by HOL Oct 7, 2026Material review Oct 7, 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 Anthropic/@anthropic-ai/claude-code (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Anthropic/@anthropic-ai/claude-codegeneric>=0 <2.1.1292.1.129

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Anthropic/@anthropic-ai/claude-code.
  2. 2Review the reported fix. Update Anthropic/@anthropic-ai/claude-code to 2.1.129 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 7, 2026

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

  2. Source modified

    Oct 7, 2026

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

  3. First seen by HOL

    Oct 7, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

Claude Code validated that a target file path resided within the project working directory at permission-check time, but re-resolved the path at write time without repeating that validation. This time-of-check to time-of-use (TOCTOU) gap allowed an attacker who could write to the workspace to atomically replace a project file with a symlink, causing Claude Code to follow the symlink and write its output to an arbitrary file outside the project sandbox. Exploitation required the ability to win a race condition against the write operation and write access to the shared workspace, enabling a lower-privileged attacker to redirect benign edits to sensitive files (e.g., shell configuration) in a higher-privileged session. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version. Thank you to hackerone.com/c_h4ck_0 for reporting this issue.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-22, CWE-61, CWE-367
Source
CVE List V5
Source checked
Oct 7, 2026
References
1 linked source
Open source record