CVE-2022-29221: PHP Code Injection by malicious block or filename in Smarty

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-24 · updated 2026-06-17
Weakness: CWE-94

Description

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.45 and 4.1.1, template authors could inject php code by choosing a malicious {block} name or {include} file name. Sites that cannot fully trust template authors should upgrade to versions 3.1.45 or 4.1.1 to receive a patch for this issue. There are currently no known workarounds.

Affected products

Debian Linux: 9.0, 10.0, 11.0
Fedoraproject Fedora: 36, 37
Smarty: before 3.1.45; from 4.0.0 before 4.1.1 — fixed in 3.1.45, 4.1.1

How to fix

Upgrade to a fixed version: Smarty 3.1.45, 4.1.1. Check the vendor advisory for mitigations.

References

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