CVE-2026-105219 [HIGH] – Mammoth.js 1.3.0 before 1.12.3 contains a regular expression denial of service vulnerabili

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.