What’s Vulnerable › Vulnerabilities

CVE-2021-26120

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 82.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-22 · updated 2026-06-17
• Weakness: CWE-94

Description

Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.

Affected products

• Debian Linux: 9.0, 10.0, 11.0
• Smarty: before 3.1.39 — fixed in 3.1.39

How to fix

Upgrade to a fixed version: Smarty 3.1.39. Check the vendor advisory for mitigations.

References

• https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md
• https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
• https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
• https://security.gentoo.org/glsa/202105-06
• https://www.debian.org/security/2022/dsa-5151
• https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md
• https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
• https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
• https://security.gentoo.org/glsa/202105-06
• https://www.debian.org/security/2022/dsa-5151

Get alerted when CVE-2021-26120 or the next vulnerability affects your stack