CVE-2026-31945

{
  "id": "CVE-2026-31945",
  "sourceIdentifier": "[email protected]",
  "published": "2026-03-27T20:16:30.060",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "LibreChat is a ChatGPT clone with additional features. Versions 0.8.2-rc2 through 0.8.2 are vulnerable to a server-side request forgery (SSRF) attack when using agent actions or MCP. Although a previous SSRF vulnerability (https://github.com/danny-avila/LibreChat/security/advisories/GHSA-rgjq-4q58-m3q8) was reported and patched, the fix only introduced hostname validation. It does not verify whether DNS resolution results in a private IP address. As a result, an attacker can still bypass the protection and gain access to internal resources, such as an internal RAG API or cloud instance metadata endpoints. Version 0.8.3-rc1 contains a patch."
    },
    {
      "lang": "es",
      "value": "LibreChat es un clon de ChatGPT con características adicionales. Las versiones 0.8.2-rc2 a 0.8.2 son vulnerables a un ataque de falsificación de petición del lado del servidor (SSRF) al usar acciones de agente o MCP. Aunque una vulnerabilidad SSRF anterior (https://github.com/danny-avila/LibreChat/security/advisories/GHSA-rgjq-4q58-m3q8) fue reportada y parcheada, la solución solo introdujo la validación del nombre de host. No verifica si la resolución DNS resulta en una dirección IP privada. Como resultado, un atacante aún puede eludir la protección y obtener acceso a recursos internos, como una API RAG interna o puntos finales de metadatos de instancias en la nube. La versión 0.8.3-rc1 contiene un parche."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "danny-avila",
          "product": "LibreChat",
          "versions": [
            {
              "version": ">= 0.8.2-rc2, < 0.8.3-rc1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-03-30T19:00:49.640233Z",
          "id": "CVE-2026-31945",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "criteria": "cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*",
              "matchCriteriaId": "8D828ED6-3F44-4DD1-B29F-62D8977AF33A"
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              "matchCriteriaId": "21865C8B-C628-4275-A552-89F64EF22918"
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  "references": [
    {
      "url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f92m-jpv7-55p2",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f92m-jpv7-55p2",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}