CriticalVulnerabilityLLM-specific

CVE-2025-65099: Claude Code code execution via Yarn plugins in untrusted directories

Source: NVD(opens in a new tab)
Identifier: CVE-2025-65099
Published: November 19, 2025
Record updated: October 9, 2026

Affected: @anthropic-ai/claude-code < 1.0.39
Fixed in: 1.0.39
released July 1, 2025, 141 days before disclosure
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

CVE-2025-65099 affects Claude Code before version 1.0.39 when it runs on a machine with Yarn 3.0 or above. A project's yarn plugins could execute code before the user accepted the startup trust dialog, provided the user started Claude Code in an untrusted directory.

Mitigation

This issue has been patched in version 1.0.39.

Details

Scores and exploitation

CVSS score: 9.8(critical)
Patch available: Yes
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-94
Attack pattern (CAPEC): CAPEC-242

Affected

Packages: @anthropic-ai/claude-code@< 1.0.39 (fixed: 1.0.39)
Vendors: Anthropic

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: API
Impact: Integrity,
Confidentiality,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-65099

First tracked: February 15, 2026 at 08:52 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Topics

AI agents

Summary

Mitigation

Topics

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