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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
According to https://nvd.nist.gov/vuln/detail/CVE-2025-15599, the affected versions of DOMPurify are 3.1.3 through 3.2.6. The python-jupytext builds currently in Fedora have DOMPurify 3.3.1, so are presumably not affected.