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Vulnerability record · CVE-2026-9147 · published 18 July 2026

CVE-2026-9147: Code injection vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.22% · top 88.3% CWE-94 · Code injection Deferred
8.5CVSS 4.0 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
28 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-9147), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.