The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
3.10.12-1~22.04.183.12.3-1ubuntu0.173.14.4-1ubuntu0.22.7.6-8ubuntu0.6+esm303.4.3-1ubuntu1~14.04.7+esm213.5.2-2ubuntu0~16.04.4~14.04.1+esm112.7.12-1ubuntu0~16.04.18+esm223.5.2-2ubuntu0~16.04.13+esm252.7.17-1~18.04ubuntu1.13+esm153.6.9-1~18.04ubuntu1.13+esm10Exploitability
AV:NAC:LAT:NPR:NUI:NVulnerable System
VC:NVI:NVA:HSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N