Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-105219",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-10-04T17:09:54.186Z",
    "dateReserved": "2026-10-04T13:04:00.479Z",
    "datePublished": "2026-10-04T17:09:54.186Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-10-04T17:09:54.186Z"
      },
      "datePublic": "2026-09-01T00:00:00.000Z",
      "title": "Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser",
      "descriptions": [
        {
          "lang": "en",
          "value": "Mammoth.js 1.3.0 before 1.12.3 contains a regular expression denial of service vulnerability in the style map tokeniser in lib/styles/parser/tokeniser.js due to overlapping regex alternatives. Attackers can supply a crafted .docx with an unterminated quoted string of repeated backslash escapes in mammoth/style-map to block the Node.js event loop."
        }
      ],
      "affected": [
        {
          "vendor": "mwilliamson",
          "product": "mammoth.js",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1.3.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "1.12.3"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Inefficient Regular Expression Complexity",
              "cweId": "CWE-1333",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/mwilliamson/mammoth.js/issues/487",
          "name": "GitHub Issue #487",
          "tags": [
            "issue-tracking"
          ]
        },
        {
          "url": "https://github.com/mwilliamson/mammoth.js/commit/dc49225425c2c07de0a6dc3529f2386c82a032b4",
          "tags": [
            "patch"
          ]
        },
        {
          "url": "https://github.com/mwilliamson/mammoth.js/blob/1.12.2/lib/styles/parser/tokeniser.js#L6-L30",
          "tags": [
            "technical-description"
          ]
        },
        {
          "url": "https://github.com/mwilliamson/mammoth.js",
          "tags": [
            "product"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/mammoth-js-1.3.0-before-1.12.3-redos-via-style-map-tokeniser",
          "name": "VulnCheck Advisory: Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Siyang Wu",
          "type": "finder"
        }
      ]
    }
  }
}