CVE-2026-15308

High

Open

TLP:CLEAR

Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations

NVD CVE.org

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Description

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

Details

CVSS Score: 8.7
EPSS Score ⓘ: 0.62%

46.4th percentile
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
Confidence: 90%
Published: Jul 9, 2026
Last Modified: Aug 11, 2026

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