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GHSA-qvc2-mg72-jjhx
No affected components available
Summary
Sanitized DOM trees can be unsafe to serialize when a custom policy allows raw-text elements such as <style> or <script>.
The issue affects DOM trees that are constructed or modified programmatically and then passed through sanitize_dom() with a policy that keeps these elements. Text nodes inside <style> and <script> are serialized literally, so attacker-controlled text containing the matching closing tag sequence can break out of the raw-text context and inject HTML into the serialized output.
The default sanitization policy is not affected because it drops the contents of style and script.
Details
The root cause is in HTML serialization of raw-text elements. In serialize.py, text children of script and style are emitted verbatim:
_LITERAL_TEXT_SERIALIZATION_ELEMENTS = frozenset({"script", "style"})
def _serialize_text_for_parent(text: str | None, parent_name: str | None) -> str:
if not text:
return ""
if parent_name in _LITERAL_TEXT_SERIALIZATION_ELEMENTS:
return text
return _escape_text(text)
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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