| Component | LibreChat |
| Severity | high (CVSS 8.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
| Published (NVD) | 2026-03-27 |
| Last modified | 2026-06-17 |
| Affected versions | librechat < 0.8.3 librechat = 0.8.3 librechat = 0.8.3 |
| Fixed in | 0.8.3 |
| Weakness | CWE-918 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade LibreChat to
0.8.3or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
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