CVE-2021-26120: PHP Code Injection by malicious function name in smarty

critical Affects smarty/smarty. Feed 2026.10.29.4, updated 2026-10-29; published 2021-02-26; advisory modified 2024-02-16.

PHP Code Injection by malicious function name in smarty

Package: smarty/smarty Composer
Affected versions: <3.1.39
Fixed in: 3.1.39
Severity: critical CVSS 9.8
Exploitation: not on CISA KEV · EPSS 82% (99.7th percentile)
Published: 2021-02-26
Source: osv.dev

References

CWE-94

NVD record smarty/smarty advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2021-26119 high Sandbox escape through template_object in smarty same package: smarty/smarty
CVE-2022-29221 high PHP Code Injection by malicious block or filename in Smarty same package: smarty/smarty
CVE-2018-13982 high Smarty Path Traversal Vulnerability same package: smarty/smarty
CVE-2014-8350 high Smarty arbitrary PHP code execution same package: smarty/smarty
CVE-2017-1000480 critical Smarty PHP code injection same package: smarty/smarty
CVE-2018-16831 medium Smarty Path Traversal Vulnerability same package: smarty/smarty