CVE-2026-82531: smarty 0 to before 4.5.8, 5.0.0 to before 5.8.5

Affected technology

smarty · 0 to before 4.5.8, 5.0.0 to before 5.8.5
smarty-php

Description’s affected range: before 4.5.8 and 5.x before 5.8.5

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Attackers can supply assigned data containing a forged SmartyNocache marker that is copied verbatim into the regenerated PHP cache file, executing arbitrary PHP on include for remote code execution. Vendor/CNA’s CVSS 4.0 assessment (base score 9.2/10) rates confidentiality, integrity and availability impact as high.