CVE-2026-21852

medium · 5.3

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.

5.3

CVSS

26.3%

EPSS (exploit prob.)

98th

EPSS percentile

2026-01-21

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-522

Affected products

Vendor	Product	Affected versions
anthropic	claude_code	< 2.0.65

Check a specific version with /api/v1/cve/match.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-jh7p-qr78-84p7

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-21852