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OS Command InjectionWeakness · CWE-78

CVE-2026-11834

HIGH · 8.7 CVSS v4.0 Published 2026-06-22
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
92/100
Remediation priority · Urgent
No privileges Zero-click

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 · unedited
A command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state. Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.

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 confidence

Command injection vulnerability in TP-Link router DHCP option processing due to insufficient validation of externally supplied DHCP option data. An adjacent attacker can send crafted DHCP responses containing malicious DHCP options with shell commands that get executed during device initialization or provisioning, particularly in factory-default states.

MitigationApply vendor firmware updates when available. Until patches are released, avoid connecting unconfigured devices to untrusted networks and implement network segmentation to limit adjacent attacker access.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS 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
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify TP-Link router model
    Check router label or access web UI/admin panel to confirm device manufacturer and model number
    Affected if Device is not a TP-Link product
  2. Check firmware version
    Access router admin panel (typically 192.168.0.1 or 192.168.1.1), navigate to System or Status section to view firmware version; alternatively, check vendor support website for your specific model
    Affected if Firmware version is older than vendor-patched version (compare against vendor release notes)
  3. Verify DHCP client is enabled
    Check router network settings to confirm DHCP client functionality is active (router is configured to obtain IP via DHCP from upstream ISP or network)
    Affected if DHCP client is enabled and router processes DHCP responses from upstream network
  4. Confirm factory-default or initial setup state
    Check if router has been reconfigured from defaults or is in fresh-out-of-box state; verify if default credentials still apply or if custom admin password has been set
    Affected if Router is in factory-default state or undergoing initial provisioning/reset
  5. Assess network exposure
    Determine if router WAN/LAN interface connects to untrusted or shared network where adjacent attackers could inject malicious DHCP responses
    Affected if Router is connected to network segment accessible to untrusted adjacent attackers

User is affected if device is a TP-Link router with DHCP client enabled, running unpatched firmware, and connected to a network where adjacent attackers can deliver malicious DHCP responses, especially during factory-default initialization.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware updates when available. Until patches are released, avoid connecting unconfigured devices to untrusted networks and implement network segmentation to limit adjacent attacker access.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-11834 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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