CVE-2026-31943
Last modified
CVE-2026-31943 is a high-severity vulnerability rated 8.5/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Librechat | Librechat | < 0.8.3 | — |
| Librechat | Librechat | 0.8.3 | Rc1 |
References
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4cExploit, Vendor Advisory
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4cExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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