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CVE-2026-31943

Estado: ModificadaAlta (8.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CWE-918 (SSRF) con acceso autenticado remoto (PR:L, AV:N) permite eludir protecciones y acceder a servicios internos y metadatos en red adyacente. T1090 como proxy SSRF; T1005 por lectura de credenciales de cloud (169.254.169.254).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationNetwork Intrusion Prevention

Tecnologías afectadas (1)

Librechat — Librechat

CWE

Referencias

JSON original (NVD)

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          "options": [
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          "privilegesRequired": "LOW",
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  "published": "2026-03-27T20:16:29.897",
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    }
  ],
  "lastModified": "2026-06-17T10:34:49.033",
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