CVE-2026-31945

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.

• CWE-918

• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f92m-jpv7-55p2Exploit, Mitigation, Vendor Advisory
• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f92m-jpv7-55p2Exploit, Mitigation, Vendor Advisory

Published

Mar 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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