CVE-2026-15308
A remote, anonymous attacker can exploit a vulnerability in CPython to conduct a Denial of Service attack.
CSIRTS triage
- What
- A vulnerability allows a remote attacker to conduct a Denial of Service attack.
- Who is affected
- Remote, anonymous attackers targeting CPython deployments.
- Urgency
- Remediation is urgent due to the high severity of the Denial of Service risk.
- Action
- Apply patches as they become available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Advisory coverage (3)
- high[NEW] [high] CPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
- unknownVulnerability in CPython (July 10, 2026)cert-fr-avis · 2026-07-10
- highCVE-2026-15308: The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through …nvd · 2026-07-09
External references
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[](https://www.csirts.com/cve/CVE-2026-15308)