CVE-2026-15308
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- EPSS probability
- 0.64%
- CWE
- CWE-400
- Published
- 2026-07-09
- Last modified
- 2026-08-13
Affected products
- Python Software Foundation CPython
- Python Software Foundation CPython
- Python Software Foundation CPython
- Python Software Foundation CPython
- Python Software Foundation CPython
- Python Software Foundation CPython
Weakness type
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