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.
History

Mon, 05 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Sun, 04 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Mwilliamson
Mwilliamson mammoth.js
Vendors & Products Mwilliamson
Mwilliamson mammoth.js

Sun, 04 Oct 2026 17:30:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-04T17:09:54.186Z

Updated: 2026-10-05T14:55:01.763Z

Reserved: 2026-10-04T13:04:00.479Z

Link: CVE-2026-105219

cve-icon Vulnrichment

Updated: 2026-10-05T14:50:31.880Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-04T18:16:34.777

Modified: 2026-10-06T16:00:36.547

Link: CVE-2026-105219

cve-icon Redhat

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