{
  "affected": [
    {
      "affectedData": [
        {
          "product": "toml-node",
          "vendor": "BinaryMuse",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "toml-node is a TOML parser for Node.js and the browser. Prior to 5.0.1, toml.parse() passes unbounded hexadecimal, octal, binary, and decimal digit sequences from lib/parser.js to BigInt() before reduceInteger() in lib/compiler.js checks whether the resulting value fits the TOML 64-bit integer range. Converting a sufficiently long integer string consumes super-linear CPU time and synchronously blocks the Node.js event loop, allowing one attacker-supplied TOML document to deny service to concurrent work in the process. The later range check cannot prevent the conversion cost because it executes after BigInt(). This issue is fixed in version 5.0.1."
    }
  ],
  "id": "CVE-2026-114144",
  "lastModified": "2026-10-22T16:48:25.420",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-21T21:17:57.103",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/BinaryMuse/toml-node/commit/9d52e384f6030932174d1afb0d910154dd62dead"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/BinaryMuse/toml-node/releases/tag/v5.0.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-9qmh-m7c6-f92p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "toml"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-114144"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-22T16:36:50Z",
    "nvd_published_at": "2026-10-21T21:17:57Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n`toml.parse()` converts integer literals (hex, octal, binary, and decimal) to `BigInt` without first bounding the length of the digit sequence. Since `BigInt(string)` construction from a very long numeric string runs in super-linear time, a single small, well-formed TOML document containing one long integer literal can pin a Node.js process\u0027s event loop at 100% CPU for several seconds \u2014 a denial of service for any application that parses attacker-supplied or third-party TOML. No authentication or complex crafting is required.\n\n### Details\nIn `lib/parser.js`, the grammar actions that build integer nodes call `BigInt()` directly on the matched digit text, with no upper bound on its length:\n\n- `lib/parser.js:326` \u2014 hex: `BigInt(\u00270x\u0027 + stripUnderscores(digits))`\n- `lib/parser.js:327` \u2014 octal: `BigInt(\u00270o\u0027 + stripUnderscores(digits))`\n- `lib/parser.js:328` \u2014 binary: `BigInt(\u00270b\u0027 + stripUnderscores(digits))`\n- `lib/parser.js:329` \u2014 decimal: `BigInt(stripUnderscores(text))`\n\nThe parser does enforce a nesting-depth limit (`MAX_DEPTH`, default 500, `lib/parser.js:4343`) to guard against stack overflow from deeply nested arrays/inline tables (per GHSA-82x6-q7mm-w9cf). However, that guard only bounds *structural nesting* \u2014 it does not bound the length of a single scalar token.\n\nThe subsequent 64-bit range check in `lib/compiler.js` (`reduceInteger`, lines 143\u2013150, comparing against `INT64_MIN` / `INT64_MAX` defined at lines 3\u20134) happens **after** the expensive `BigInt()` conversion has already completed. It therefore provides no protection against this cost \u2014 the CPU time is already spent by the time the value is rejected as out of range.\n\n### PoC\n\n```js\nconst toml = require(\u0027toml\u0027);\n\nconst N = 5_000_000; // ~5 MB request body\nconst doc = \u0027x = 0x\u0027 + \u0027f\u0027.repeat(N);\n\nconst start = Date.now();\ntry {\n  toml.parse(doc); // eventually throws \"outside the 64-bit signed integer range\" \u2014\n                    // but only after the costly conversion has run\n} catch (e) {}\n\nconsole.log(\u0027elapsed:\u0027, Date.now() - start, \u0027ms\u0027);\n```\n\n**Measured results:**\n\n| Digits (hex) | Approx. payload size | Parse time |\n|---:|---:|---:|\n| 200,000 | ~200 KB | 141 ms |\n| 400,000 | ~400 KB | 276 ms |\n| 800,000 | ~800 KB | 685 ms |\n| 1,600,000 | ~1.6 MB | 1,761 ms |\n| 5,000,000 | ~5 MB | 6,061 ms |\n\nGrowth is clearly super-linear. The same behavior reproduces for plain decimal literals (3,000,000 `\u00279\u0027` digits \u2192 ~6.3 s).\n\n### Impact\nAny application that calls `toml.parse()` on untrusted or third-party input \u2014 config upload endpoints, CI/CD tools ingesting user-supplied `.toml` files, package managers, linters, editors/language servers \u2014 is exposed.\n\nDuring the conversion, the event loop is fully blocked. In a typical single-threaded Node.js server this stalls **all** concurrent request handling, not just the request containing the malicious payload. A single ~5 MB request is sufficient to cause several seconds of full CPU denial of service.\n\n**Suggested fix:** Reject digit sequences above a reasonable length *before* calling `BigInt()`, analogous to the existing `maxDepth` option. A 64-bit signed integer requires at most 20 decimal digits or 16 hex digits, so any digit sequence significantly longer than that is guaranteed to fail the existing range check anyway, and can be rejected with a cheap `.length` comparison instead of paying for the full `BigInt` conversion.",
  "id": "GHSA-9qmh-m7c6-f92p",
  "modified": "2026-10-22T16:36:50Z",
  "published": "2026-10-22T16:36:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-9qmh-m7c6-f92p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114144"
    },
    {
      "type": "WEB",
      "url": "https://github.com/BinaryMuse/toml-node/commit/9d52e384f6030932174d1afb0d910154dd62dead"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/BinaryMuse/toml-node"
    },
    {
      "type": "WEB",
      "url": "https://github.com/BinaryMuse/toml-node/releases/tag/v5.0.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "toml-node: Uncontrolled resource consumption (CPU DoS) via unbounded-length integer literals in toml.parse()"
}