AIKIDO-2026-190935
mammoth is vulnerable to Uncontrolled Recursion
53
Medium Risk
This Affects:
mammothTL;DR
The numbering parser resolves a numbering definition's numStyleLink by following it to another numbering style and recursing into that style. A crafted document whose numbering styles reference one another, or a style that references itself, makes this resolution recurse without ever terminating. Converting such a document exhausts the call stack and aborts the conversion, denying service for that input. The fix records already-visited numbering IDs and stops when a cycle is detected.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application converts untrusted .docx documents, via either the library convert API or the command-line interface.
Background info
mammoth is vulnerable to Uncontrolled Recursion in versions 1.4.9 - 1.12.0.
How to fix this
Upgrade the mammoth library to the patch version.
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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