CVE-2026-4149
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 · uneditedSonos Era 300 SMB Response Out-Of-Bounds Access Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Sonos Era 300. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the DataOffset field within SMB responses. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the kernel. Was ZDI-CAN-28345.
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 · high confidenceOut-of-bounds memory access vulnerability in Sonos Era 300 SMB response parsing. The device fails to validate the DataOffset field in SMB responses, allowing an attacker to read/write past allocated buffer boundaries. This enables unauthenticated remote code execution in kernel context.
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< 83.1-61240CVSS 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.
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Confirm Sonos Era 300 modelAccess Sonos app or web interface, navigate to Settings > About My System, and verify the listed device model is Era 300Affected if Device is a Sonos Era 300 unit
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Check installed firmware versionIn Sonos app or web interface, go to Settings > About My System and locate the firmware version number (e.g., 83.x-xxxxx)Affected if Firmware version is lower than 83.1-61240 (e.g., 83.0-xxxxx, 82.x-xxxxx)
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Verify SMB service is enabledAccess Sonos web interface or diagnostics, check Network Settings or Services for SMB/CIFS status. Alternatively, scan the device IP for open SMB ports (445, 139) using nmap -p 445,139 <device_ip>Affected if SMB service is enabled and responding on ports 445 or 139
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Assess network exposure of SMBDetermine if the Sonos device SMB ports are accessible from untrusted networks by reviewing firewall rules or performing external port scan from non-local subnetsAffected if SMB ports are reachable from outside local network segment or untrusted VLANs
Device is affected if it is a Sonos Era 300 running firmware below 83.1-61240 with SMB service enabled and accessible.
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 · scoped83.1-61240
Apply vendor firmware patch when released; until then, disable SMB functionality if unused and isolate device on network segment to reduce attack surface.
Era 300 Firmware 83.1-61240 or later
- Identify the current firmware version of the Sonos Era 300 by accessing the Sonos app and navigating to Settings > System > About My System
- Download and install the latest Sonos Era 300 firmware version through the Sonos app or Sonos website
- After firmware update, verify the installed version is 83.1-61240 or later
- Confirm the SMB service is functioning normally post-update
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-4149 — 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-2026-4149 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
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- 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
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