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OS Command InjectionWeakness · CWE-78

CVE-2026-40852

HIGH · 7.2 CVSS v3.1 Published 2026-05-27
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable 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 highly authenticated attacker can alter the config generator injecting a payload into future created configurations. The device is not correctly checking this configuration value before passing it to an system execute leading to code execution. This can result in a total loss of confidentiality, integrity and availability.

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 confidence

A highly authenticated attacker can inject malicious payloads into the configuration generator, which are then executed when the configuration is processed by a system execute call. The device fails to validate configuration values before passing them to the execution layer, enabling arbitrary code execution.

MitigationImplement strict input validation and sanitization on all configuration values before they are used in system execute calls. Use allowlist validation where possible and avoid passing unsanitized user-controlled input to execution functions.

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
Network
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/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 checks

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

  1. Identify the configuration generator component
    Locate whether your system has a configuration generator or configuration export feature. This may be accessible via CLI commands, API endpoints, web interfaces, or configuration tools. Search system documentation, feature lists, or command outputs for terms like 'config generator', 'configuration export', 'config build', or similar functionality.
    Affected if Your system includes a configuration generator that creates configuration output processed by system execute calls
  2. Determine if configuration values are passed to system execute calls
    Examine how configuration is processed in your system. Review system logs, code analysis, or configuration workflows to identify if generated configuration values are directly passed to execution functions such as exec(), system(), shell(), popen(), or equivalent APIs. Look for configuration processing paths that invoke system commands.
    Affected if Configuration values from the generator are directly used in system execute calls without intermediary processing
  3. Verify input validation on configuration values
    Inspect the configuration generator implementation to check if validation or sanitization is performed on configuration values before they are passed to execution functions. Look for input filtering, allowlist validation, sanitization routines, or input validation logic in the code paths between configuration generation and system execution.
    Affected if No input validation or sanitization is implemented on configuration values before they reach system execute calls
  4. Compare installed version to affected ranges
    Locate the version of your system's configuration generator or firmware. This information is typically available via system settings, version display commands (such as 'show version', 'system info', or similar), firmware metadata, or software inventory. Compare your version against any documented affected version ranges.
    Affected if Your installed version falls within affected version ranges and the configuration generator passes values to system execute calls without validation

You are affected if your system has a configuration generator that passes unvalidated configuration values directly to system execute calls, and your version is within the affected range.

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

Implement strict input validation and sanitization on all configuration values before they are used in system execute calls. Use allowlist validation where possible and avoid passing unsanitized user-controlled input to execution functions.

Have this fixed Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,580
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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-2026-40852 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