CVE-2026-31943 | THREATINT

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.

PUBLISHED Reserved 2026-03-10 | Published 2026-03-27 | Updated 2026-03-31 | Assigner GitHub_M

HIGH: 8.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Problem types

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

Product status

< 0.8.3

affected

References

github.com/...reChat/security/advisories/GHSA-w5r7-4f94-vp4c exploit

github.com/...reChat/security/advisories/GHSA-w5r7-4f94-vp4c

cve.org (CVE-2026-31943)

nvd.nist.gov (CVE-2026-31943)

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