CVE intelligence

CVE-2026-15308

Vulnerability intelligence

Published Jul 9, 2026Sources checked Sep 12, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-15308 and is rated High severity with a CVSS score of 7.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.6%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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.