What functions and functionality is relevant?

This delta adds functionality for extracting extended properties from an XLSX file.

Why is this vulnerable?

Regex StackOverflow DoS in extended properties reader for XLSX.

Is this a replay and/or is inspired by anything?

Not a replay. This is a variant of other regex DoS challenges in the competition.

What makes it interesting?

It may be challenging to find the vulnerability, and it should be fairly challenging to generate a POV.