EUVD-2026-92122

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...

CVE-2026-105219

Mammoth.js versions 1.3.0 before 1.12.3 are vulnerable to a Regular Expression Denial of Service (ReDoS) . The flaw exists in the style map tokeniser located in lib/styles/parser/tokeniser.js due to overlapping regex alternatives . An attacker can provide a crafted .docx file containing an unterm...

CVE-2026-97151: Improperly Controlled Modification of Object Prototype Attributes

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...