CVE-2026-97151
mammoth (aka mammoth.js) before 1.12.2 is vulnerable to prototype pollution when reading the styles defined in a document. Converting a crafted .docx file allows an attacker to add arbitrary properties to Object.prototype. In 1.11.0 through 1.12.1, applications that convert further documents in the same process and return the converted HTML can also disclose the contents of local server files (to the party supplying the documents) by setting externalFileAccess to true.
CVE-2026-97151
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-2026-97151
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.
[
{
"repo": "https://github.com/mwilliamson/mammoth.js",
"vendor": "mwilliamson",
"modules": [
"docx styles reader"
],
"product": "mammoth.js",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "1.12.2",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/mammoth",
"packageName": "mammoth",
"programFiles": [
"lib/docx/styles-reader.js"
],
"collectionURL": "https://registry.npmjs.org",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "readStylesXml"
}
]
}
]- Related CVEs
- CVE-2026-97151
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #583 · Revision 1
- Added to Heist Feed
- Publisher date