High severity7.5NVD Advisory· Published Oct 4, 2026
CVE-2026-105219
CVE-2026-105219
Description
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.
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Affected products
1- Range: <1.12.3
Patches
Vulnerability mechanics
References
4- github.com/mwilliamson/mammoth.js/blob/1.12.2/lib/styles/parser/tokeniser.jsnvd
- github.com/mwilliamson/mammoth.js/commit/dc49225425c2c07de0a6dc3529f2386c82a032b4nvd
- github.com/mwilliamson/mammoth.js/issues/487nvd
- www.vulncheck.com/advisories/mammoth-js-1.3.0-before-1.12.3-redos-via-style-map-tokenisernvd
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