AI / ML CVE-2026-21852
HIGH
GHSA-jh7p-qr78-84p7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
Claude Code versions prior to 2.0.65 allow attackers to steal Anthropic API keys from users by crafting malicious repositories that redirect API calls to attacker-controlled servers before the trust confirmation dialog appears. When a victim opens an infected repository, the tool automatically reads malicious configuration settings and sends API requests containing credentials before displaying any security prompt, enabling credential theft. Users should upgrade to version 2.0.65 or later, though auto-update users have already received the patch.
Technical ContextAI
Classified as CWE-522 (Insufficiently Protected Credentials). Affects Claude Code. 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, poten
RemediationAI
Update to version 2.0.65 or later. Restrict network access to the affected service where possible.
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Same weakness CWE-522 – Insufficiently Protected Credentials
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today