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Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-105219

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-105219

mammoth.js

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "mwilliamson",
    "product": "mammoth.js",
    "versions": [
      {
        "status": "affected",
        "version": "1.3.0",
        "lessThan": "1.12.3",
        "versionType": "semver"
      }
    ],
    "packageURL": "pkg:npm/mammoth",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-105219

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#8679 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement