CVE-2026-21852— Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation
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I. Basic Information for CVE-2026-21852
Vulnerability Information
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Vulnerability Title
Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation
Source: NVD (National Vulnerability Database)
Vulnerability Description
Claude Code is an agentic coding tool. Prior to version 2.0.65, vulnerability in Claude Code's project-load flow allowed malicious repositories to exfiltrate data including Anthropic API keys before users confirmed trust. An attacker-controlled repository could include a settings file that sets ANTHROPIC_BASE_URL to an attacker-controlled endpoint and when the repository was opened, Claude Code would read the configuration and immediately issue API requests before showing the trust prompt, potentially leaking the user's API keys. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to version 2.0.65, which contains a patch, or to the latest version.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的凭证保护机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Claude Code 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Claude Code是Anthropic开源的一个代理编码工具。 Claude Code 2.0.65之前版本存在安全漏洞，该漏洞源于项目加载流程允许恶意存储库在用户确认信任前泄露数据，可能导致API密钥泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| anthropics | claude-code | < 2.0.65 | - |
II. Public POCs for CVE-2026-21852
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|---|
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IV. Related Vulnerabilities
Same product: claude-code
- CVE-2026-40068
Claude Code arbitrary code execution via git worktree common - CVE-2026-39861
Claude Code: Sandbox Escape via Symlink Following Allows Arb - CVE-2026-35603
Claude Code: Insecure System-Wide Configuration Loading Enab - CVE-2026-33068
Claude Code has a Workspace Trust Dialog Bypass via Repo-Con - CVE-2026-25725
Claude Code Has Sandbox Escape via Persistent Configuration
Same vendor: anthropics
- CVE-2026-40068
Claude Code arbitrary code execution via git worktree common - CVE-2026-41686
Claude SDK for TypeScript has Insecure Default File Permissi - CVE-2026-39861
Claude Code: Sandbox Escape via Symlink Following Allows Arb - CVE-2026-35603
Claude Code: Insecure System-Wide Configuration Loading Enab - CVE-2026-34451
Claude SDK for TypeScript: Memory Tool Path Validation Allow
Same weakness: CWE-522
- CVE-2026-42295
Argo Workflows: Exposure of artifact repository credentials - CVE-2026-41506
go-git Credential leak via cross-host redirect in smart HTTP - CVE-2025-62345
HCL BigFix RunBookAI is affected by a Continued availability - CVE-2026-23927
Agent 2 Oracle plugin TNS connection string injection via th - CVE-2026-42367
GeoVision LPC2011/LPC2211 Web Interface / ssi.cgi privilege
V. Comments for CVE-2026-21852
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