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PatchSiren cyber security CVE debrief

CVE-2026-9259 Canon Inc. CVE debrief

CVE-2026-9259 is a HIGH-severity vulnerability (CVSS Score: 7.1) affecting Canon EOS Network Setting Tool Version 1.5.0 or earlier. The vulnerability is caused by improper validation of server certificates.

Vendor
Canon Inc.
Product
EOS Network Setting Tool for Windows
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-18
Advisory published
2026-06-16
Advisory updated
2026-06-18

Who should care

Users of Canon EOS Network Setting Tool Version 1.5.0 or earlier should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The vulnerability is caused by improper validation of server certificates in Canon EOS Network Setting Tool Version 1.5.0 or earlier. This could potentially allow an attacker to intercept or manipulate sensitive data.

Defensive priority

HIGH

Recommended defensive actions

  • Update Canon EOS Network Setting Tool to the latest version.
  • Refer to [ref-4](https://canon.jp/support/support-info/260615vulnerability-response) for more information.
  • Refer to [ref-5](https://psirt.canon/advisory-information/cp2026-005/) for more information.
  • Refer to [ref-6](https://www.canon-europe.com/support/product-security/) for more information.
  • Refer to [ref-7](https://www.usa.canon.com/about-us/to-our-customers/cpa2026-005-vulnerability-remediation-for-eos-network-setting-tool) for more information.

Evidence notes

The vendor is identified as Canon based on the evidence from reference_domain_candidate.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9259 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9259

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

  • CVE-2026-9259 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9259

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://canon.jp/support/support-info/260615vulnerability-response

    f98c90f0-e9bd-4fa7-911b-51993f3571fd

  • Source reference

    Unverified legacy reference

    URL: https://psirt.canon/advisory-information/cp2026-005/

    f98c90f0-e9bd-4fa7-911b-51993f3571fd

  • Source reference

    Unverified legacy reference

    URL: https://www.canon-europe.com/support/product-security/

    f98c90f0-e9bd-4fa7-911b-51993f3571fd

  • Source reference

    Unverified legacy reference

    URL: https://www.usa.canon.com/about-us/to-our-customers/cpa2026-005-vulnerability-remediation-for-eos-network-setting-tool

    f98c90f0-e9bd-4fa7-911b-51993f3571fd

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.