CVE-2026-31943

HighCVSS 8.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Weakness enumeration

CWE-918

Affected software

Vendor	Product	Versions
danny-avila	LibreChat	< 0.8.3

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4cExploit, Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4cExploit, Vendor Advisory

Timeline

Published: Mar 27, 2026
Last modified: Jun 17, 2026
NVD status: Modified

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