EUVD-2026-16765
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Lifecycle Timeline
3Tags
Description
LibreChat is a ChatGPT clone with additional features. Versions 0.8.2-rc2 through 0.8.2 are vulnerable to a server-side request forgery (SSRF) attack when using agent actions or MCP. Although a previous SSRF vulnerability (https://github.com/danny-avila/LibreChat/security/advisories/GHSA-rgjq-4q58-m3q8) was reported and patched, the fix only introduced hostname validation. It does not verify whether DNS resolution results in a private IP address. As a result, an attacker can still bypass the protection and gain access to internal resources, such as an internal RAG API or cloud instance metadata endpoints. Version 0.8.3-rc1 contains a patch.
Analysis
Server-side request forgery in LibreChat 0.8.2-rc2 through 0.8.2 allows authenticated users to access internal network resources via incomplete DNS validation bypass. Despite a prior SSRF patch, the current hostname validation fails to check if DNS resolution points to private IP addresses, enabling attackers to reach internal RAG APIs and cloud metadata endpoints. …
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Remediation
Within 24 hours: Identify all LibreChat deployments running versions 0.8.2-rc2 through 0.8.2 and assess network exposure of internal APIs and metadata endpoints. Within 7 days: Upgrade all affected instances to LibreChat 0.8.3-rc1 or later. …
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