# CVE-2021-29454: smarty3: Smarty is a template engine for PHP, facilitating the separation ofpresentation (HTML/CSS) from application logic

CVE-2021-29454 is fixed in 2 products on 1 platform, first by smarty3 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1, released January 10, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-29454
- Priority: High
- CVSS: 8.8 (High)
- EPSS: 0.0186
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 10, 2022

## Description

Smarty is a template engine for PHP, facilitating the separation ofpresentation (HTML/CSS) from application logic. Prior to versions 3.1.42and 4.0.2, template authors could run arbitrary PHP code by crafting amalicious math string. If a math string was passed through as user provideddata to the math function, external users could run arbitrary PHP code bycrafting a malicious math string. Users should upgrade to version 3.1.42 or4.0.2 to receive a patch.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | smarty3 Debian 12.15 (bookworm) | 3.1.45-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |
| Linux | smarty3 Debian 13.5 (trixie) | 3.1.45-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |
| Linux | smarty3 Debian 14 | 3.1.45-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |
| Linux | smarty3 Ubuntu 18.04.6 LTS (bionic) | 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1 | [smarty3 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-smarty3-3.1.31-20161214.1.c7d42e4-selfpack1-3ubuntu0.1.md) | Jan 10, 2022 |
| Linux | smarty3 Ubuntu 20.04 LTS (focal) | 3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1 | [smarty3 3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-smarty3-3.1.34-20190228.1.c9f0de05-selfpack1-1ubuntu0.1-esm1.md) | Jan 10, 2022 |
| Linux | smarty3 Ubuntu 22.04.1 LTS (jammy) | 3.1.39-2ubuntu1 | [smarty3 3.1.39-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-smarty3-3.1.39-2ubuntu1.md) | Jan 10, 2022 |
| Linux | smarty3 Ubuntu 24.10 (oracular) | 3.1.39-2ubuntu1 | [smarty3 3.1.39-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-smarty3-3.1.39-2ubuntu1.md) | Jan 16, 2026 |
| Linux | smarty3 Ubuntu 25.04 (plucky) | 3.1.39-2ubuntu1 | [smarty3 3.1.39-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-smarty3-3.1.39-2ubuntu1.md) | Jan 16, 2026 |
| Linux | smarty4 Debian 12.15 (bookworm) | 4.1.1-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |
| Linux | smarty4 Debian 13.5 (trixie) | 4.1.1-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |
| Linux | smarty4 Debian 14 | 4.1.1-1 | [DEBIAN-CVE-2021-29454](https://patchblox.com/security/data/fix/linux/debian-cve-2021-29454.md) | Jan 10, 2022 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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