The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
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Score 4.3 from GitHub Security Advisory published 2025-06-17. NVD baseline CVSS 4.3; sources differ by 0.0.
The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
June 17, 2025
April 15, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Red Hat Security Advisory: Red Hat Ceph Storage
Red Hat Security Advisory: Red Hat Ceph Storage
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python3.12-venv (3.12.3-1ubuntu0.8) @ noble | 2026-05-21 | ubuntu |
| redhat | rhceph/rhceph-7-rhel9:1769508455 | 2026-02-03 | redhat |
| redhat | rhceph/rhceph-8-rhel9:1769512383 | 2026-02-02 | redhat |
| redhat | rhui5/rhua-rhel9:1768377012 | 2026-01-15 | redhat |
| redhat | discovery/discovery-ui-rhel9:1767904573 | 2026-01-08 | redhat |
| redhat | python39-devel:3.9-8100020251126112422.d47b87a4 | 2025-12-18 | redhat |
| redhat | python3.9-0:3.9.25-2.el9_7 | 2025-12-18 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
HTMLParser quadratic complexity when processing malformed inputs
RHSA-2025:23342 — Moderate
RHSA-2025:23530 — Moderate
RHSA-2026:0685 — Moderate
Python vulnerabilities
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msrc · redhat