EUVD-2026-16764
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Lifecycle Timeline
3Tags
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.
Analysis
Server-Side Request Forgery (SSRF) in LibreChat versions prior to 0.8.3 allows authenticated users to bypass IP validation and force the application server to make HTTP requests to internal network resources. The vulnerability stems from improper validation of IPv4-mapped IPv6 addresses in hex-normalized form, enabling access to cloud metadata services (AWS 169.254.169.254), loopback addresses, and RFC1918 private networks. …
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Remediation
Within 24 hours: Inventory all LibreChat deployments and document current versions in use; restrict application access to users with business-critical need only. Within 7 days: Implement network segmentation to prevent LibreChat servers from reaching 169.254.169.254, loopback addresses, and internal RFC1918 networks via firewall or security group rules; deploy WAF rules to block IPv6 hex-normalized request patterns if applicable. …
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