CVE-2026-9147
RCE in uproot via crafted ROOT files allowing arbitrary Python execution.
Is CVE-2026-9147 being exploited?
Not confirmed. CVE-2026-9147 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-9147?
CVE-2026-9147 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-9147?
Yes. A fix has been recorded for CVE-2026-9147. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-9147 affect?
CVE-2026-9147 affects uproot (Python library), Applications that open/process ROOT files, HEP analysis pipelines and data services ingesting ROOT files. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-9147?
Stop processing untrusted ROOT files; apply vendor patch when available; sandbox file parsing.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution: attacker-supplied ROOT files can execute arbitrary Python in the process opening the file, enabling data theft, persistence, or full system compromise.
Immediate action required
- affected<= 5.7.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.