CVE-2026-49293

{
  "id": "CVE-2026-49293",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-19T19:16:36.297",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. Versions up to and including 1.1.0 parse hexadecimal / octal / binary integer literals via a hand-written `parseBigInt` loop that multiplies a `BigInt` accumulator by the radix once per input digit. Each iteration performs a `BigInt * BigInt` operation on an accumulator that grows linearly with the number of digits already consumed, so the whole loop is O(n²) in the literal length. The lexer regex places no upper bound on the literal length, so a single TOML document containing one ~500 kB hex literal pins one CPU core for ~40 seconds on a modern laptop (Apple M-series, Node v22). Memory amplification is bounded but CPU amplification is severe and grows quadratically: doubling the literal length quadruples the work. A caller that invokes `load()` on attacker-controlled TOML (configuration upload endpoints, CI/CD systems ingesting third-party `*.toml`, IDE plugins, build tools) is exposed to a single-request CPU exhaustion DoS. Version 1.1.1 fixes the issue."
    },
    {
      "lang": "es",
      "value": "js-toml es un analizador TOML para JavaScript, totalmente compatible con la especificación TOML 1.0.0. Las versiones hasta la 1.1.0 inclusive analizan literales enteros hexadecimales / octales / binarios mediante un bucle parseBigInt escrito a mano que multiplica un acumulador BigInt por la base una vez por cada dígito de entrada. Cada iteración realiza una operación BigInt * BigInt en un acumulador que crece linealmente con el número de dígitos ya consumidos, por lo que todo el bucle es O(n²) en la longitud del literal. La expresión regular del analizador léxico no impone un límite superior a la longitud del literal, por lo que un único documento TOML que contenga un literal hexadecimal de ~500 kB fija un núcleo de CPU durante ~40 segundos en un portátil moderno (serie Apple M, Node v22). La amplificación de memoria está acotada, pero la amplificación de CPU es grave y crece cuadráticamente: duplicar la longitud del literal cuadruplica el trabajo. Un llamador que invoca load() en TOML controlado por un atacante (puntos finales de carga de configuración, sistemas CI/CD que ingieren *.toml de terceros, complementos de IDE, herramientas de compilación) está expuesto a un DoS por agotamiento de CPU de una sola solicitud. La versión 1.1.1 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "sunnyadn",
          "product": "js-toml",
          "versions": [
            {
              "version": "< 1.1.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-22T14:09:42.727540Z",
          "id": "CVE-2026-49293",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-407"
        },
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:sunnyadn:js-toml:*:*:*:*:*:node.js:*:*",
              "versionEndExcluding": "1.1.1",
              "matchCriteriaId": "9C4EB3F2-9198-41C8-BF40-63A7E2BDFF11"
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  "references": [
    {
      "url": "https://github.com/sunnyadn/js-toml/commit/1abcb31dc7b1fa88e4c848a8d108891cfbb96fa2",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.1",
      "source": "[email protected]",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-wp3c-266w-4qfq",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-wp3c-266w-4qfq",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}