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Could you give examples? There were plenty of problems with certain standards layered atop of XML or self-made implementations of XML parsers and unparsers [1], but there is also a well tested set of standard compliant XML libraries that avoid those issues.

[1]: An internationally known consulting firm, that I won't name, had (perhaps has) an internal tool that compiles an Excel description of a service interface into actual XML parsing code that accepts only one hard-coded namespace alias for each given namespace. Over the years I've come across multiple companies with that bug in some service. Everytime I looked into it, the reason was the same internal tool of that consulting firm. And I've met multiple times people who had already discovered that same thing.