CVE-2026-9147
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
Vulnerability in the uproot library allows remote code execution by opening a crafted ROOT file. An attacker can inject malicious Python code into streamer metadata, which is then executed during class source code generation and compilation.
Risk Assessment
The organization risks system compromise by an attacker who can supply a crafted ROOT file to an application using a vulnerable version of uproot.
Recommendation
Update the uproot library to the latest version containing the security fix. Avoid opening ROOT files from untrusted sources.
Related vulnerabilities
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Original NVD description (English source)
uproot dynamically generates Python class source code from ROOT TStreamerInfo records in a file and compiles it at runtime. Some file-controlled streamer metadata fields (for example, streamer element names) are interpolated into the generated Python source without safe quoting via repr() or the !r format specifier. An attacker who can supply a crafted ROOT file can place Python expression-breaking content into a streamer metadata field. When uproot generates and invokes the corresponding reader method, the injected Python expression is evaluated in the context of the process opening the file, resulting in arbitrary Python code execution in applications that open or process attacker-controlled ROOT files with affected uproot code paths.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS