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CVE-2026-22034 is a critical vulnerability in the Snuffleupagus PHP security module . The flaw exists in versions prior to 0.13.0 when a non-default upload validation feature is enabled. This feature relies on scripts based on the Vulcan Logic Disassembler (VLD) to inspect uploaded files. If the VLD PHP extension is installed but not available to the Command-Line Interface (CLI) Server API (SAPI), the validation process fails. Instead of securely denying the upload, the module “fails open” (CWE-636) . Consequently, every file sent in a multipart POST request is inadvertently evaluated and executed as PHP code by the engine . An unauthenticated attacker can exploit this by uploading a seemingly innocent file (like an image) containing malicious PHP payloads, leading to immediate remote code execution (RCE) on the server . The issue was resolved in version 0.13.0 by patching the validation logic to fail securely .
dailycve form:
Platform: Snuffleupagus
Version: <0.13.0
Vulnerability : RCE via upload
Severity: Critical (9.2)
date: 08/01/2026
Prediction: Patch already available
What Undercode Say:
Analytics:
This vulnerability specifically affects non-default configurations where `upload_validation` is enabled and set to use VLD-based scripts . The root cause is PHP’s failure to error out when a module (VLD) is missing from the CLI SAPI, causing the security check to be bypassed silently . The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H) indicates a network-based, low-complexity attack with no privileges required, although it does require the specific vulnerable configuration to be present (Attack Requirements: Present) .
How Exploit:
An attacker can craft a multipart POST request to a vulnerable application. The file part of the request, even if named image.jpg, will be executed as PHP. The exploit does not require authentication.
Example exploitation using curl The content of malicious.php (e.g., <?php system($_GET['cmd']); ?>) is uploaded as a text file. curl -X POST -F "[email protected]" http://vulnerable-target.com/upload-handler.php If the request contains multiple files, all are evaluated.
Protection from this CVE:
The primary mitigation is upgrading to Snuffleupagus version 0.13.0 or later . If immediate patching is impossible, administrators should disable the `upload_validation` feature or ensure the VLD extension is available to the CLI SAPI . The official fix can also be backported by applying the specific patch commit .
Check current Snuffleupagus version php -m | grep snuffleupagus php -i | grep snuffleupagus Upgrade command (example for Debian-based systems) sudo apt-get update && sudo apt-get install snuffleupagus=0.13.0-1 Verify VLD extension availability for CLI php -m | grep vld Backporting the fix (conceptual patch application) cd /path/to/snuffleupagus/source wget https://github.com/jvoisin/snuffleupagus/commit/9278dc77bab2a219e770a1b31dd6797bc9070e37.patch git apply 9278dc77bab2a219e770a1b31dd6797bc9070e37.patch Rebuild and install the module
Impact:
Successful exploitation leads to unauthenticated remote code execution . This grants the attacker the ability to compromise the web server fully, leading to data breaches (confidentiality impact: HIGH), website defacement or backdooring (integrity impact: HIGH), and potential service disruption (availability impact: HIGH) . The “failing open” nature transforms a configuration oversight into a critical RCE vector .
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Reported By: nvd.nist.gov
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