CVE-2026-105219

Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser

Published Oct 4, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mwilliamson
Mwilliamson mammoth.js
Vendors & Products Mwilliamson
Mwilliamson mammoth.js
Type Values Removed Values Added
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.
Title Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 5, 2026, 2:55 PM
Reserved
Oct 4, 2026, 1:04 PM
Status
Awaiting Analysis
Published
Oct 4, 2026, 6:16 PM
Modified
Oct 6, 2026, 4:00 PM