CVE-2026-31943

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.

CVSS v3 8.5 HIGH

8.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4c	Exploit Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4c	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:librechat:librechat::::::::
	cpe:2.3:a:librechat:librechat:0.8.3:rc1::::::
	cpe:2.3:a:librechat:librechat:0.8.3:rc2::::::

History

No history.

Information

Published : 2026-03-27 20:16

Updated : 2026-06-17 10:34

NVD link : CVE-2026-31943

Mitre link : CVE-2026-31943

CVE.ORG link : CVE-2026-31943

JSON object : View

Products Affected

librechat

librechat

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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