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CVE-2026-39413

Estado: ModificadaMedia (6.5)—

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode() call does not explicitly deny the 'none' algorithm, a crafted token without a signature will be accepted as valid, leading to unauthorized access. This vulnerability is fixed in 1.4.14.

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).

Tecnologías afectadas (1)

Hkuds — Lightrag

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-39413",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-39413",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-08T20:18:28.117904Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.2,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 0.5
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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          "product": "LightRAG",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.4.14"
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  "published": "2026-04-08T20:16:25.877",
  "references": [
    {
      "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgf",
      "tags": [
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        "Mitigation",
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      "url": "https://github.com/github/advisory-database/issues/7373",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
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  "descriptions": [
    {
      "lang": "en",
      "value": "LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode() call does not explicitly deny the 'none' algorithm, a crafted token without a signature will be accepted as valid, leading to unauthorized access. This vulnerability is fixed in 1.4.14."
    },
    {
      "lang": "es",
      "value": "LightRAG proporciona generación aumentada por recuperación simple y rápida. Antes de la 1.4.14, la API de LightRAG es vulnerable a un ataque de confusión de algoritmo JWT donde un atacante puede falsificar tokens especificando 'alg': 'none' en la cabecera JWT. Dado que la llamada a jwt.decode() no deniega explícitamente el algoritmo 'none', un token manipulado sin firma será aceptado como válido, lo que lleva a un acceso no autorizado. Esta vulnerabilidad se corrigió en la 1.4.14."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "80A2BB57-B14C-4542-8F7F-D0D6F20AFC31",
              "versionEndExcluding": "1.4.14"
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  "sourceIdentifier": "security-advisories@github.com"
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