Server-Side Request Forgery in LibreChat by Danny Avila
CVE-2026-31943

8.5HIGH

Key Information:

Vendor

Danny-avila

Status
Librechat
Vendor
CVE Published:
27 March 2026

What is CVE-2026-31943?

LibreChat, a ChatGPT clone designed with advanced features, contains a vulnerability prior to version 0.8.3 where the isPrivateIP() function does not properly handle IPv4-mapped IPv6 addresses in their hex-normalized format. This flaw permits authenticated users to bypass server-side request forgery (SSRF) protections, enabling them to make unauthorized HTTP requests to critical internal network resources, such as cloud metadata services and private IP address ranges. The vulnerability is addressed in version 0.8.3.

Affected Version(s)

LibreChat < 0.8.3

References

https://github.com/danny-avila/LibreChat/security/advisor...
x_refsource_CONFIRM

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.