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CVE-2026-15308 is a CPU resource-exhaustion vulnerability in Python's incremental HTML parser, html.parser.HTMLParser. Processing attacker-controlled data containing repeated unterminated markup declarations can cause excessive CPU consumption and denial of service in applications using the vulnerable parser. Exact affected upstream Python version ranges are not established.
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No public exploit code observed for this vulnerability.
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55 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The supplied CVSS vectors describe a network-accessible vulnerability with low attack complexity, requiring neither privileges nor user interaction, and causing high availability impact without confidentiality or integrity impact. The affected product and underlying flaw are not identified. A patch publication date of July 25, 2026, is listed.
A Python HTML parser denial-of-service vulnerability in which repeated unterminated markup declarations can cause CPU exhaustion.
A Python HTML-parser denial-of-service vulnerability where repeated unterminated markup declarations can consume CPU resources. It affects Python packages on Rocky Linux 9 and is addressed by the CIQ/Rocky Linux security update CRLSA-2026_39798.
A Python HTML parser CPU denial-of-service vulnerability triggered by repeated unterminated markup declarations. It affects Python packages installed on Rocky Linux 10.2 covered by CIQ advisory crlsa-2026_40856.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.