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CVE-2026-31943

8.5 high SSVC exploitation: poc Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.5 · librechatNVD modified 2026-10-26 21:10

Affected (CPE criteria) 3

  • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.3:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.3:rc2:*:*:*:*:*:*

References 2