What’s Vulnerable › Vulnerabilities

CVE-2026-9147: uproot 5.7.4 and prior Code Injection via TStreamerInfo Metadata

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-18 · updated 2026-10-24
• Weakness: CWE-94

Description

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.

Affected products

• scikit-hep uproot: all versions

References

• https://github.com/SaiTeja-Erukude/CVE-2026-9147-uproot-rce
• https://github.com/scikit-hep/uproot5
• https://github.com/scikit-hep/uproot5/commit/c045c2824295d907d2e705f31110c742928e50e7
• https://github.com/scikit-hep/uproot5/security/advisories/GHSA-6946-mq52-g438
• https://www.vulncheck.com/advisories/uproot-and-before-code-injection-via-tstreamerinfo-metadata

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