AIKIDO-2026-935898
mammoth is vulnerable to Denial of Service (DoS)
65
Medium Risk
This Affects:
mammothTL;DR
When resolving list numbering, the parser follows numStyleLink references between numbering definitions to locate a level. A numbering definition that links to itself, directly or through a cycle, causes the lookup to recurse without termination. Converting a crafted document exhausts the call stack and consumes excessive CPU and memory, crashing or hanging the conversion. The fix tracks already-visited numbering identifiers 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 you convert untrusted or externally supplied documents.
Background info
mammoth is vulnerable to Denial of Service (DoS) in versions 1.4.8 - 1.12.0.
How to fix this
Upgrade the mammoth library to the patch version.
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