CVE-2026-105219 HIGH

CVE-2026-105219: Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser

Vendor Mwilliamson

Product mammoth.js

Weakness CWE-1333

Published October 4, 2026

Last update October 4, 2026

View on NVD All CVEs

CVSS base score

8.7/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality —

Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 4, 2026 CVE published

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-105219 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/1333.html AskarLabs — CWE-1333 write-up Inefficient Regular Expression Complexity (ReDoS)