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Vulnerability Intelligence
Miggo AI
Miggo AIMiggo AIMiggo AIRoot Cause AnalysisThe vulnerability stems from the attribute quoting logic in the serializer. The commit 9b8d8eb introduced a ternary quote_attr_values system and expanded the regex pattern to include legacy-sensitive characters. The pre-patch code used a boolean flag and a limited regex (quoteAttributeSpec), failing to properly escape attributes containing characters like U+000B or ` which could break attribute context in legacy browsers. The serialize method directly controls attribute serialization and was the focal point of the security fix.
PythonPython| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| html5lib | pip | < 0.99999999 | 0.99999999 |
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