Multiple vulnerabilities in CPython (June 25, 2026)
Multiple vulnerabilities have been discovered in CPython. Some of them allow an attacker to cause remote denial of service, a breach of data confidentiality, and a breach of data integrity.
CSIRTS triage
- What
- Multiple vulnerabilities can lead to remote denial of service and breaches of data confidentiality and integrity.
- Who is affected
- Users of CPython.
- Urgency
- Remediation is urgent due to the potential for denial of service and data breaches.
- Action
- Apply updates as they become available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0800/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-119400.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all scored CVEs.
- Low exploitation riskCVE-2026-08640.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
- Low exploitation riskCVE-2026-119720.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-11940 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-0864 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-11972 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for CPython
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] CPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
- low[UPDATE] [low] CPython: Vulnerability allows file manipulationcert-bund · 2026-07-10
- medium[UPDATE] [medium] CPython: Vulnerability allows bypassing security measurescert-bund · 2026-07-10
- medium[UPDATE] [medium] Cpython: Multiple vulnerabilitiescert-bund · 2026-07-10
- low[UPDATE] [low] CPython: Vulnerability allows unspecified attackcert-bund · 2026-07-10
- medium[UPDATE] [medium] cPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
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