CVE-2026-19036
Received Received - Intake

Command Injection in Shibby Tomato Firmware

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: VulDB

Description
A security flaw has been discovered in Shibby Tomato 1.28.0000. This affects the function sub_40F88C of the file /tmp/ppp/wanoptions. The manipulation of the argument ppp_custom results in os command injection. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. This project is superseded by FreshTomato.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-19036
EUVD
EUVD-2026-53868

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
shibby tomato 1.28.0000
shibby_tomato tomato 1.28.0000

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

CVE-2026-19036 is a command injection flaw in Shibby Tomato firmware version 1.28.0000. It affects the function sub_40F88C in the file /tmp/ppp/wanoptions. The vulnerability allows authenticated web administrators to execute arbitrary OS commands with root privileges by manipulating the ppp_custom NVRAM key. The attack occurs because user input is written directly to a pppd options file without sanitization, enabling remote code execution when pppd processes the file.

Detection Guidance

Check if Shibby Tomato firmware version 1.28.0000 is running. Inspect the file /tmp/ppp/wanoptions for suspicious entries like pty, connect, disconnect, init, or welcome directives. Monitor for unexpected root-level command execution or file modifications in /tmp.

Impact Analysis

This vulnerability allows attackers with web admin credentials to execute arbitrary commands as root on the affected device. This could lead to full system compromise, unauthorized access, data theft, or disruption of services. The attack is network-based and can be triggered remotely if the device is configured with PPPoE, PPTP, or L2TP WAN types.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to unauthorized access to sensitive data and potential data breaches. GDPR requires protection of personal data, while HIPAA mandates safeguards for protected health information. A successful exploit could result in unauthorized data exposure, violating these regulations and potentially leading to legal penalties.

Mitigation Strategies

Upgrade to FreshTomato or a patched version. Disable the ppp_custom NVRAM key if unused. Implement input validation to block dangerous pppd directives in the httpd. Restrict web admin access and monitor for unauthorized PPP connection attempts.

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