high8.5
CVE-2026-31943
LibreChat is a ChatGPT clone with additional features.
Impact
LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, `isPrivateIP()` in `packages/api/src/auth/domain.ts` fails to detect IPv4-mapped IPv6 addresses in their hex-normalized form, allowing any authenticated user to bypass SSRF protection and make the server issue HTTP requests to internal network resources — including cloud metadata services (e.g., AWS `169.254.169.254`), loopback, and RFC1918 ranges. Version 0.8.3 fixes the issue.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Librechat | Librechat | before 0.8.3 Version 0.8.3 |