Vulnerability Intelligence Report
Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations
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.
No Active Exploit Signals
CVSS Base Score
8.7
HIGH
EPSS Probability:0.64%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-400 ↗CWE-400
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Python Software Foundation | CPython | 0 < 3.10.21 (affected), 3.11.0 < 3.11.16 (affected), 3.12.0 < 3.12.14 (affected), 3.13.0 < 3.13.15 (affected), 3.14.0 < 3.14.7 (affected), 3.15.0a1 < 3.15.0b4 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.637%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Python Software Foundation · Vendor · USA |
| Reserved | 2026-07-09T17:04:11 |
| Published | 2026-07-09T17:10:57 |
| Last Updated | 2026-08-13T00:28:26 |
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