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CVE-2022-29221

HighPublished

PHP Code Injection by malicious block or filename in Smarty

Published: May 24, 2022
Updated: Apr 23, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

4.9%

Low · next 30 days

Percentile: 91.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2022-29221-PoCPoC
CVE-2022-29221 Proof of Concept Code - Smarty RCE

Responsible use

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