CVE-2026-105219
Published:October 04, 2026
Updated:October 09, 2026
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.
Affected Packages
mammoth (CDN_JS):
Affected version(s) >=1.3.0 <1.12.3Fix Suggestion:
Update to version 1.12.3https://github.com/mwilliamson/mammoth.js.git (GITHUB):
Affected version(s) >=1.3.0 <1.12.3Fix Suggestion:
Update to version 1.12.3mammoth (NPM):
Affected version(s) >=1.3.0 <1.12.3Fix Suggestion:
Update to version 1.12.3Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Regular Expression Complexity
EPSS
Base Score:
0.36