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PatchSiren cyber security CVE debrief

CVE-2026-36176 GNCC CVE debrief

CVE-2026-36176 is a HIGH-severity vulnerability in GNCC GP5 v7.1.76. The vulnerability allows physically-proximate attackers to extract pre-signed Backblaze B2 upload URLs (PUT requests) stored in plaintext to the serial console, enabling unauthorized operations via monitoring the serial UART interface.

Vendor
GNCC
Product
GP5
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Administrators and users of GNCC GP5 v7.1.76, especially those concerned with physical security and data integrity.

Technical summary

GNCC GP5 v7.1.76 stores pre-signed Backblaze B2 upload URLs (PUT requests) in plaintext to the serial console. Physically-proximate attackers can extract these active tokens to perform unauthorized operations via monitoring the serial UART interface.

Defensive priority

HIGH

Recommended defensive actions

  • Restrict physical access to the serial console.
  • Implement secure storage and handling of pre-signed Backblaze B2 upload URLs.
  • Monitor for and respond to potential unauthorized access attempts.

Evidence notes

The vulnerability was discovered in GNCC GP5 v7.1.76.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-36176 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-36176

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

  • CVE-2026-36176 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-36176

    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.