Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.9%
CVSS Severity
CVSS v3 Score 8.5
Products affected by CVE-2026-31943
-
cpe:2.3:a:librechat:librechat:-
-
cpe:2.3:a:librechat:librechat:0.0.1
-
cpe:2.3:a:librechat:librechat:0.0.2
-
cpe:2.3:a:librechat:librechat:0.0.3
-
cpe:2.3:a:librechat:librechat:0.0.4
-
cpe:2.3:a:librechat:librechat:0.0.5
-
cpe:2.3:a:librechat:librechat:0.0.6
-
cpe:2.3:a:librechat:librechat:0.1.0
-
cpe:2.3:a:librechat:librechat:0.1.1
-
cpe:2.3:a:librechat:librechat:0.2.0
-
cpe:2.3:a:librechat:librechat:0.3.0
-
cpe:2.3:a:librechat:librechat:0.3.3
-
cpe:2.3:a:librechat:librechat:0.4.0
-
cpe:2.3:a:librechat:librechat:0.4.1
-
cpe:2.3:a:librechat:librechat:0.4.2
-
cpe:2.3:a:librechat:librechat:0.4.3
-
cpe:2.3:a:librechat:librechat:0.4.4
-
cpe:2.3:a:librechat:librechat:0.4.5
-
cpe:2.3:a:librechat:librechat:0.4.6
-
cpe:2.3:a:librechat:librechat:0.4.7
-
cpe:2.3:a:librechat:librechat:0.4.8
-
cpe:2.3:a:librechat:librechat:0.5.0
-
cpe:2.3:a:librechat:librechat:0.5.1
-
cpe:2.3:a:librechat:librechat:0.5.2
-
cpe:2.3:a:librechat:librechat:0.5.3
-
cpe:2.3:a:librechat:librechat:0.5.4
-
cpe:2.3:a:librechat:librechat:0.5.5
-
cpe:2.3:a:librechat:librechat:0.5.6
-
cpe:2.3:a:librechat:librechat:0.5.7
-
cpe:2.3:a:librechat:librechat:0.5.8
-
cpe:2.3:a:librechat:librechat:0.5.9
-
cpe:2.3:a:librechat:librechat:0.6.0
-
cpe:2.3:a:librechat:librechat:0.6.1
-
cpe:2.3:a:librechat:librechat:0.6.10
-
cpe:2.3:a:librechat:librechat:0.6.5
-
cpe:2.3:a:librechat:librechat:0.6.6
-
cpe:2.3:a:librechat:librechat:0.6.9
-
cpe:2.3:a:librechat:librechat:0.7.0
-
cpe:2.3:a:librechat:librechat:0.7.1
-
cpe:2.3:a:librechat:librechat:0.7.2
-
cpe:2.3:a:librechat:librechat:0.7.3
-
cpe:2.3:a:librechat:librechat:0.7.4
-
cpe:2.3:a:librechat:librechat:0.7.5
-
cpe:2.3:a:librechat:librechat:0.7.6
-
cpe:2.3:a:librechat:librechat:0.7.7
-
cpe:2.3:a:librechat:librechat:0.7.8
-
cpe:2.3:a:librechat:librechat:0.7.9
-
cpe:2.3:a:librechat:librechat:0.8.0
-
cpe:2.3:a:librechat:librechat:0.8.1
-
cpe:2.3:a:librechat:librechat:0.8.2
-
cpe:2.3:a:librechat:librechat:0.8.3