There is a MEDIUM severity vulnerability affecting CPython. The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
Please see the linked CVE ID for the latest information on affected versions: * https://www.cve.org/CVERecord?id=CVE-2025-6069 * https://github.com/python/cpython/pull/135464
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