CVE-2026-105219 Mammoth.js - Denial of Service

Mammoth.js > 1.3.0 < 1.12.3 contains a denial of service caused by overlapping regex alternatives in the style map tokeniser in lib/styles/parser/tokeniser.js, letting attackers block the Node.js event loop by supplying crafted .docx files.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
4 October 2026
Updated
15 October 2026
Weakness
CWE-1333

Vendor fix

Upgrade to version 1.12.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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