CVE-2026-9147uproot dynamically generates Python class source code from ROOT TStreamerInfo records in a file and compiles it at runtime.
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No exploitation reported and no EPSS estimate yet.
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
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.