CVE-2026-42471
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 · uneditedUnsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The sync-invoke client (Connection.php:76) calls unserialize() on data received from the server response, enabling client-side RCE if connecting to a malicious server.
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 confidenceThe MixPHP Framework 2.x sync-invoke client in Connection.php:76 directly deserializes server response data using PHP's unsafe unserialize() function. When a client connects to a malicious server, the attacker can inject crafted serialized PHP objects that execute arbitrary code upon deserialization on the client machine.
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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/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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Locate MixPHP Framework installationSearch for the MixPHP vendor directory or composer.json file in your project. Look for a 'mix-php' or 'mixphp' package directory under vendor/.Affected if MixPHP Framework is present in the project dependencies
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Determine installed MixPHP versionCheck the composer.lock file for the 'mixphp' package version, or look for a VERSION file in the MixPHP library directory. Compare the version number to the affected range (versions up to and including 2.2.17).Affected if The installed version is 2.2.17 or earlier
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Inspect Connection.php for unsafe unserializeLocate the Connection.php file in the sync-invoke client code (typically at vendor/mix-php/framework/src/SyncInvoke/Connection.php or similar path). Open the file and examine line 76 or nearby lines for the use of unserialize() without prior validation.Affected if The file contains unserialize() called on server response data without sanitize or validation checks
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Verify client code path is reachableSearch your codebase for instantiations of the sync-invoke client (look for 'new Connection' or calls to sync-invoke client methods). Check if your application makes outbound connections to external or untrusted servers using this client.Affected if The application uses the sync-invoke client to connect to servers that are not fully trusted or verified
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Check server TLS verification configurationExamine the client connection configuration for TLS certificate validation settings. Look for verify_peer, verify_peer_name, or similar SSL context options being disabled or not enforced.Affected if TLS certificate validation is disabled or the client connects to servers without verifying certificates
Your environment is affected if MixPHP Framework version 2.2.17 or earlier is installed AND the sync-invoke client code contains unsafe unserialize() AND your application uses this client to connect to potentially untrusted servers.
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.
From vendor dataUpgrade to MixPHP Framework version beyond 2.2.17 when patched, or implement message authentication (e.g., HMAC signatures) and use json_decode instead of unserialize for data exchange with trusted servers only.
- 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-2026-42471 — 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-2026-42471 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
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