CVE-2026-31943HIGH 8.5EPSS p11.5%

CVE-2026-31943CVE-2026-31943

Description

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.

Scoring

CVSS 3.18.5 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
EPSS0.21% probability of exploitation · percentile 11.5% · 2026-06-18T12:00:27Z
Published2026-03-27
Last modified2026-03-31

Underlying weaknesses· 1

CWE-918

References

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

1

TypeTargetConfidenceTier
WeaknessServer-Side Request Forgery (SSRF)cwe-9180%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.