The vulnerability of the etree.iterparse() and ETCompatXMLParser() functions in the Lxml library for processing XML and HTML markup allows attackers to read arbitrary files.

The vulnerability of the etree.iterparse and ETCompatXMLParser functions in the Lxml library for processing XML and HTML markup is related to incorrect restrictions on XML references to external objects. Exploiting this vulnerability could allow an attacker to read arbitrary files...

lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

...

GHSA-VFMQ-68HX-4JFW lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

Impact Using either of the two parsers in the default configuration with resolveentities=True allows untrusted XML input to read local files. Patches lxml 6.1.0 changes the default to resolveentities='internal', thus disallowing local file access by default. Workarounds Setting the resolveentitie...