Pachno Framework Critical Deserialization Flaw Allows RCE

The National Vulnerability Database has issued an alert for CVE-2026-40044, a critical deserialization vulnerability impacting Pachno version 1.0.6. This flaw, rated with a CVSS score of 9.8, enables unauthenticated attackers to execute arbitrary code by injecting malicious serialized objects directly into cache files. This is a nasty one, folks — it’s the kind of bug that makes security pros sigh deeply.

According to the National Vulnerability Database, attackers can write PHP object payloads to world-writable cache files. What makes this particularly dangerous is that these files often have predictable names within the cache directory. Crucially, these malicious objects are then unserialized during the framework’s bootstrap process, meaning the code executes before any authentication checks even have a chance to kick in. This effectively gives an attacker a free pass to RCE without needing valid credentials.