CVE-2026-9259
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper validation of server certificates in Canon EOS Network Setting Tool Version 1.5.0 or earlier
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe Canon EOS Network Setting Tool versions 1.5.0 and earlier improperly validates server certificates, potentially allowing man-in-the-middle attacks where an attacker could intercept or manipulate network communications between the tool and Canon servers.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 1.5.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Locate the Canon EOS Network Setting Tool installationCheck Program Files (or Program Files x86) for a Canon folder containing EOS Network Setting Tool, or find the executable via Start menu searchAffected if The tool is installed on the system
-
Check the installed version numberRight-click the EOSNetworkSettingTool.exe file, select Properties, and view the Version tab to find the File VersionAffected if The version displayed is earlier than 1.5.1
-
Verify the exact version stringOpen the application if possible and check Help > About, or cross-reference the file version with Canon's release notesAffected if The version is shown as 1.5.0 or any version below 1.5.1
-
Assess network exposure riskDetermine whether the tool has been used on public or untrusted WiFi networks where MITM attacks could intercept trafficAffected if The tool was used on unsecured networks before updating to 1.5.1 or later
A user is affected if Canon EOS Network Setting Tool version 1.5.0 or earlier is installed and was used to configure camera network settings, especially on untrusted networks.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped1.5.1
Update to a patched version of Canon EOS Network Setting Tool when available, or avoid using the tool on untrusted networks until a fix is released.
1.5.1
- 1. Uninstall the current version of Canon EOS Network Setting Tool from the system
- 2. Navigate to the official Canon support website for your region (canon.jp, canon-europe.com, or usa.canon.com)
- 3. Locate and download Canon EOS Network Setting Tool version 1.5.1 or later
- 4. Verify the downloaded file integrity using checksums if provided by Canon
- 5. Install the downloaded version 1.5.1 or later
- 6. Confirm the installed version matches the fixed release
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9259 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-9259 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data