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CVE-2026-31945— LibreChat Server-Side Request Forgery using DNS resolution

Quick assessment

Affected
danny-avila LibreChat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibreChat是LibreChat开源的一个免费、高度可定制的统一 AI 对话平台，能够在一个界面中聚合并运行来自任意厂商的大模型。 LibreChat 0.8.2-rc2至0.8.2版本存在代码问题漏洞，该漏洞源于使用代理操作或MCP时存在服务端请求伪造攻击，主机名验证未检查DNS解析结果是否为私有IP地址，可能导致攻击者绕过保护并访问内部资源。

CVSS 7.7 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1102 · Web Service
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I. Basic Information for CVE-2026-31945

Vulnerability Information
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Vulnerability Title
LibreChat Server-Side Request Forgery using DNS resolution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
LibreChat 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreChat是LibreChat开源的一个免费、高度可定制的统一 AI 对话平台，能够在一个界面中聚合并运行来自任意厂商的大模型。 LibreChat 0.8.2-rc2至0.8.2版本存在代码问题漏洞，该漏洞源于使用代理操作或MCP时存在服务端请求伪造攻击，主机名验证未检查DNS解析结果是否为私有IP地址，可能导致攻击者绕过保护并访问内部资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
danny-avila LibreChat >= 0.8.2-rc2, < 0.8.3-rc1 -

II. Public POCs for CVE-2026-31945

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III. Intelligence Information for CVE-2026-31945

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Vendor Advisories for CVE-2026-31945 (1)

Same Patch Batch · danny-avila · 2026-03-27 · 4 CVEs total

CVE-2026-31943 8.5 HIGH LibreChat has SSRF protection bypass via IPv4-mapped IPv6 normalization in isPrivateIP
CVE-2026-31951 6.8 MEDIUM LibreChat's MCP Server Header Injection Enables OAuth Token Theft
CVE-2026-31950 5.3 MEDIUM LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-918

V. Comments for CVE-2026-31945

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