CVE-2026-31943
March 27, 2026
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.
Affected Packages
https://github.com/danny-avila/LibreChat.git (GITHUB):
Affected version(s) >=v0.0.1 <v0.8.3Fix Suggestion:
Update to version v0.8.3https://github.com/danny-avila/LibreChat.git (GITHUB):
Affected version(s) >=v0.0.1 <v0.8.3Fix Suggestion:
Update to version v0.8.3https://github.com/danny-avila/LibreChat.git (GITHUB):
Affected version(s) >=v0.0.1 <v0.8.3Fix Suggestion:
Update to version v0.8.3Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
EPSS
Base Score:
0.03
