scikit-hep uproot up to 5.7.4 StreamerInfo streamer element names injection

Summaryinfo

A vulnerability identified as critical has been detected in scikit-hep uproot up to 5.7.4. This vulnerability affects unknown code of the component StreamerInfo. This manipulation of the argument streamer element names causes injection. This vulnerability appears as CVE-2026-9147. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in scikit-hep uproot up to 5.7.4. Affected by this vulnerability is some unknown functionality of the component StreamerInfo. The manipulation of the argument streamer element names with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-9147 since 05/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/18/2026). MITRE ATT&CK project uses the attack technique T1055 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• scikit-hep

Name

• uproot

Version

• 5.7.0
• 5.7.1
• 5.7.2
• 5.7.3
• 5.7.4

CPE 2.3info

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CPE 2.2info

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