CVE-2026-9669
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, anonymous attacker to conduct a Denial of Service attack.
- Who is affected
- Deployments of CPython are affected.
- Urgency
- Remediation is medium urgency as the vulnerability can disrupt services.
- 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 risk0.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[UPDATE] [medium] CPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-07
- unknownUSN-8509-1: Python vulnerabilitiesubuntu · 2026-07-06
- unknownCVE-2026-9669: bz2.BZ2Decompressor reuse after error can cause a stack buffer overflowmsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-9669)