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    CVE-2026-31943

    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.

    Published:Mar 27, 2026
    Last Modified:Mar 31, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.0003
    CVSS Score:8.5

    Affected Products

    Vendor
    Danny-avila
    Product
    Libre Chat
    Vendor
    Librechat
    Product
    Librechat

    Exploits

    https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4chttps://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4c

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2026-54024 (CVSS 6.5) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CV…
    CVE-2026-54025 (CVSS 5.4) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, there is a vul…
    CVE-2026-54027 (CVSS 6.5) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/…
    CVE-2026-54029 (CVSS 5.3) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the DELETE /ap…
    CVE-2026-54033 (CVSS 7.7) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allo…
    CVE-2026-54037 (CVSS 6.5) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CV…
    CVE-2026-54030 (CVSS 8) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OA…
    CVE-2026-54040 (CVSS 5.9) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/…
    CVE-2026-54036 (CVSS 5.3) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the GET /api/a…
    CVE-2026-44654 (CVSS 5.7) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High