What is CVE-2026-31943?

CVE-2026-31943 is a high-severity vulnerability in Danny-avila Librechat, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-03-27.

How severe is CVE-2026-31943?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in Danny-avila Librechat

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…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.002 (11.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Danny-avila Librechat — versions < 0.8.3
Librechat — versions 0.8.3

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-31943?: CVE-2026-31943 is a high-severity vulnerability in Danny-avila Librechat, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-03-27.
How severe is CVE-2026-31943?: High severity. CVSS v3 base score is 8.5 out of 10.