CVE WatchSep 8, 2026

CVE-2026-83609

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the share

CVSS

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No CVSS

EPSS

0.5%

p45

KEV

—

Exploit Today

0-100

Published: Sep 1, 2026 · Last modified: Sep 8, 2026 · CWE-91 · CWE-625

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-09-242026-10-23

Technical description

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the shared reg() builder in lib/grammar.js compiles the anchored QName_exact validator with the multiline flag, so ^ and $ validate only one line instead of the complete name. createElementNS, createAttributeNS, createDocumentType, and createAttribute consequently accept a malformed XML name whose first line is valid and whose later text injects markup when serialized through either the default path or requireWellFormed: true. The triggering ECMAScript line terminators are U+000A, U+000D, U+2028, and U+2029. This issue is fixed in @xmldom/xmldom version 0.9.12.

Official references

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