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.

INFO

Published Date :

2026-03-27T19:21:50.653Z

Last Modified :

2026-03-27T19:21:50.653Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-31943 vulnerability.

No data.

REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31943.

URL Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4c cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact