CVE-2026-9147

Python code execution via unquoted streamer metadata

Published Jul 18, 2026 · Updated Jul 18, 2026

Code injection in Scikit-HEP Uproot 5.7.4 and earlier allows attackers to execute Python code through a crafted ROOT file. The class_code generator in src/uproot/streamers.py interpolates file-controlled streamer element and count names into generated Python source without safe quoting. Execution occurs when an application opens the file and generates and invokes the affected reader method, granting the payload the process's permissions.

CVSS severity8.5
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Scikit-HEP Uproot 5.7.4 and earlier allows attackers to execute Python code through a crafted ROOT file. The class_code generator in src/uproot/streamers.py interpolates file-controlled streamer element and count names into generated Python source without safe quoting. Execution occurs when an application opens the file and generates and invokes the affected reader method, granting the payload the process's permissions.

The record

CVE
CVE-2026-9147
Published
Jul 18, 2026
Updated
Jul 18, 2026
Vendor
Scikit-HEP
Product
Uproot
Classifications
CWE-94, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=5.7.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Scikit-HEP · Uprootversion=0 <=5.7.4

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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