CVE-2026-34124
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 · uneditedA denial-of-service vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP request path parsing logic. The implementation enforces length restrictions on the raw request path but does not account for path expansion performed during normalization. An attacker on the adjacent network may send a crafted HTTP request to cause buffer overflow and memory corruption, leading to system interruption or device reboot.
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 confidenceBuffer overflow vulnerability in TP-Link Tapo C520WS v2.6 HTTP request path parsing. The device enforces length restrictions on raw request paths but fails to account for path expansion during normalization, allowing an adjacent network attacker to craft HTTP requests that exceed buffer boundaries during normalization, causing memory corruption and device denial of service.
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< 1.2.4CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Identify device modelLocate the device label on the TP-Link Tapo C520WS camera or check the device information in the Tapo mobile app or web interface to confirm the exact model number.Affected if Device is not a TP-Link Tapo C520WS model
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Check firmware versionIn the Tapo app, go to Device Settings > Device Info, or access the device web interface and navigate to the firmware/version information section. Note the installed firmware version.Affected if Firmware version is less than 1.2.4 (e.g., 1.2.3, 1.2.0, etc.)
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Verify HTTP service accessibilityAttempt to access the device's HTTP web interface by entering the device IP address in a web browser. Confirm the device responds to HTTP requests on ports 80 or 443.Affected if HTTP service is accessible from a network position where an attacker could send crafted requests
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Confirm path normalization behaviorThis check requires access to device logs or the ability to send test HTTP requests. Send an HTTP request with an expanded path sequence (e.g., containing /../ patterns or multiple slashes) and observe if the device processes it without crashing or rebooting.Affected if Device reboots or becomes unresponsive after receiving specially crafted path sequences
The device is affected if it is a Tapo C520WS running firmware version 1.2.3 or earlier, and its HTTP management interface is network-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 · scoped1.2.4
Apply vendor firmware updates when available. Until then, isolate affected devices on restricted network segments to limit adjacent network attack surface.
Firmware 1.2.4 or later for Tapo C520WS
- Log in to the Tapo C520WS web interface or Tapo app to check the current firmware version
- Navigate to Settings > Device Info > Firmware Update (or similar path in the device management interface)
- Download firmware version 1.2.4 or later from the official TP-Link support website (support.tp-link.com) for the Tapo C520WS model
- Upload and install the firmware update through the device management interface
- After the device reboots, verify the firmware version has been updated to 1.2.4 or higher
- Confirm the device is functioning normally after the update
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34124 — 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-2026-34124 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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