Improper Certificate Validation in Canon EOS Network Setting Tool
CVE-2026-9259

7.1HIGH

Key Information:

Vendor

Canon Inc.

Status
Eos Network Setting Tool For Windows
Eos Network Setting Tool For Mac OS
Vendor
CVE Published:
15 June 2026

What is CVE-2026-9259?

The Canon EOS Network Setting Tool, specifically in Version 1.5.0 and earlier, has a vulnerability that arises from improper validation of server certificates. This flaw can potentially allow malicious entities to intercept communications, posing risks to data integrity and user security. Users are advised to remain vigilant and update their software to the latest version to mitigate potential security threats.

Affected Version(s)

EOS Network Setting Tool for macOS 1.5.0 or earlier

EOS Network Setting Tool for Windows 1.5.0 or earlier

References

https://psirt.canon/advisory-information/cp2026-005/
vendor-advisory
https://canon.jp/support/support-info/260615vulnerability...
vendor-advisory
https://www.usa.canon.com/about-us/to-our-customers/cpa20...
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Ryan Hausknecht (@haus3c)
.