CVE-2026-105219: Inefficient Regular Expression Complexity in mwilliamson mammoth.js
Description
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.
CVSS v4.0
Score 8.7high
Affected software
mwilliamson
mammoth.js
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-04T13:04:00.479Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac28a8bc8a8bb8b79a5ca90
Added to database: 10/04/2026, 17:19:07 UTC
Last updated: 10/04/2026, 17:19:07 UTC
Views: 1
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.