The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
Exploitability
AV:NAC:LPR:LUI:NScope
S:UImpact
C:NI:NA:L4.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:LResource Management