AIKIDO-2026-74622
mammoth is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
mammothTL;DR
The style-map tokeniser matches quoted strings with stringPrefix, a regular expression whose escaped-character alternatives overlap. An unterminated quoted string of repeated backslash escapes in a document style map makes that expression backtrack without bound and blocks the event loop. The fix rewrites stringPrefix so those alternatives no longer overlap.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you convert untrusted documents that include a style map.
Background info
mammoth is vulnerable to Denial of Service (DoS) in versions 1.3.0 - 1.12.2.
How to fix this
Upgrade the mammoth library to the patch version.
Links
Related Issue
Other
github.com/mwilliamson/mammoth.js/blob/1.12.3/NEWSgithub.com/mwilliamson/mammoth.jsgithub.com/mwilliamson/mammoth.js/blob/1.12.2/lib/styles/parser/tokeniser.js#L6-L30
vulncheck.com/advisories/mammoth-js-1.3.0-before-1.12.3-redos-via-style-map-tokeniser
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