CVE-2026-2297: SourcelessFileLoader does not use io.open_code()
CSIRTS triage
- What
- SourcelessFileLoader does not use io.open_code() when loading code, potentially bypassing code execution restrictions.
- Who is affected
- Python applications using SourcelessFileLoader for dynamic code loading.
- Urgency
- Severity unknown; represents potential code injection/execution bypass depending on deployment context.
- Action
- Update Python to version with io.open_code() integration in SourcelessFileLoader.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-2297
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-2026-22970.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-2297 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [medium] CPython: Vulnerability allows bypassing security measurescert-bund
- unknownUSN-8509-1: Python vulnerabilitiesubuntu
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