CVE-2026-3276
An attacker can exploit multiple vulnerabilities in CPython to manipulate files and trigger a Denial-of-Service condition.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to manipulate files and trigger a Denial-of-Service condition.
- Who is affected
- Deployments of CPython are affected.
- Urgency
- Remediation is medium urgency as the vulnerabilities can lead to service disruption.
- Action
- Update to the latest version of CPython.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[UPDATE] [medium] CPython: Multiple vulnerabilitiescert-bund · 2026-08-25
- unknownUSN-8509-1: Python vulnerabilitiesubuntu · 2026-07-06
- unknownCVE-2026-3276: Potential DoS via quadratic complexity in unicodedata.normalize()msrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-3276)