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PatchSiren cyber security CVE debrief

CVE-2026-10066 Shibby CVE debrief

A stack-based buffer overflow vulnerability exists in Shibby Tomato firmware up to version 1.28, specifically within the `sub_9068` function of the `tomatoups.cgi` file in the UPS Service component. The vulnerability allows remote attackers to trigger memory corruption through crafted input. This affects a deprecated firmware project that has been superseded by FreshTomato; the affected products are no longer maintained by the original vendor. The CVSS 4.0 vector indicates network attack vector with low attack complexity, low privileges required, and high impact to confidentiality, integrity, and availability. No known exploitation in the wild or ransomware campaign use has been documented.

Vendor
Shibby
Product
Tomato
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-29
Original CVE updated
2026-07-21
Advisory published
2026-05-29
Advisory updated
2026-07-21

Who should care

Network administrators managing legacy router deployments, security teams responsible for firmware lifecycle management, and organizations with embedded Linux infrastructure using Tomato-based firmware

Technical summary

The vulnerability is a stack-based buffer overflow (CWE-121) in the `sub_9068` function of `tomatoups.cgi`, part of the UPS Service component in Shibby Tomato firmware. The flaw enables remote attackers with low privileges to achieve high impact on confidentiality, integrity, and availability through network-based attacks. The affected product is end-of-life and unmaintained; users must migrate to the community-supported FreshTomato fork.

Defensive priority

HIGH

Recommended defensive actions

  • Inventory network infrastructure for devices running Shibby Tomato firmware version 1.28 or earlier
  • Prioritize replacement or firmware migration to FreshTomato for affected devices
  • Implement network segmentation to restrict access to router management interfaces
  • Monitor for anomalous requests to tomatoups.cgi endpoints
  • Consider disabling UPS service functionality if not required
  • Document end-of-life status in asset management systems

Evidence notes

Vulnerability identified in deprecated Shibby Tomato router firmware. The affected code resides in UPS service CGI handler. Project maintenance transitioned to FreshTomato community fork. No active vendor support for security patches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-10066 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-10066

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-10066 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-10066

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.