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PatchSiren cyber security CVE debrief

CVE-2026-15544 Shibby CVE debrief

A stack-based buffer overflow vulnerability was determined in Shibby Tomato up to 1.28.0000. The affected function is getupsvar in the file www/apcupsd/tomatodata.cgi of the apcupsd component. This issue allows for remote exploitation. The project is superseded by FreshTomato. Users should be aware of the potential risks associated with this vulnerability and take necessary actions to mitigate them.

Vendor
Shibby
Product
Tomato
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-13
Original CVE updated
2026-07-13
Advisory published
2026-07-13
Advisory updated
2026-07-13

Who should care

Users of Shibby Tomato up to version 1.28.0000 should be aware of this vulnerability and take necessary actions to mitigate the risk. This includes administrators, security teams, and operators responsible for maintaining and securing systems that use Shibby Tomato. Additionally, users of FreshTomato may want to verify if they are affected by this vulnerability or if their systems are properly patched.

Technical summary

The vulnerability is caused by a stack-based buffer overflow in the getupsvar function of the tomatodata.cgi file in the apcupsd component of Shibby Tomato. This can be exploited remotely, potentially allowing attackers to execute arbitrary code or cause a denial of service. The CVSS score is 7.4, indicating a high severity. It is essential to patch or mitigate this vulnerability as soon as possible.

Defensive priority

High priority should be given to patching or mitigating this vulnerability, as it can be exploited remotely and has a high CVSS score.

Recommended defensive actions

  • Patch or upgrade to a non-vulnerable version of Shibby Tomato or FreshTomato
  • Restrict access to the affected component
  • Monitor for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-13T08:16:21.150Z and has not been modified since then. The NVD entry is currently in the 'Received' status. This information is based on the provided source corpus. Further verification is recommended to confirm the accuracy of this information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15544 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15544

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

  • CVE-2026-15544 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15544

    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.