Description
The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| jython | — | — |
| python2.7 | — | — |
| python3.10 | — | 3.10.12-1~22.04.11 |
| python3.11 | — | 3.11.0~rc1-1~22.04.1~esm5 |
| python3.12 | — | 3.12.3-1ubuntu0.8 |
| python3.13 | — | 3.13.6-1 |
| python3.4 | — | 3.4.3-1ubuntu1~14.04.7+esm16 |
| python3.5 | — | 3.5.2-2ubuntu0~16.04.13+esm19 |
| python3.6 | — | 3.6.9-1~18.04ubuntu1.13+esm6 |
| python3.7 | — | 3.7.5-2ubuntu1~18.04.2+esm7 |
| python3.8 | — | 3.8.10-0ubuntu1~20.04.18+esm2 |
| python3.9 | — | 3.9.5-3ubuntu0~20.04.1+esm6 |
Similar Threats
- Unknown UBUNTU-CVE-2026-4786
- Unknown UBUNTU-CVE-2026-1502
- Unknown DEBIAN-CVE-2026-4519
- Unknown UBUNTU-CVE-2026-4519
- Unknown DEBIAN-CVE-2025-15366
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