# CVE-2021-33391: tidy: An issue in HTACG HTML Tidy v5.7.28 allows attacker to execute arbitrarycode via the -g option of the CleanNode() fun...

CVE-2021-33391 is fixed in 4 products on 1 platform, first by libtidy5deb1 2:5.6.0-11ubuntu0.20.04.1, released February 17, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-33391
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0113
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 17, 2023

## Description

An issue in HTACG HTML Tidy v5.7.28 allows attacker to execute arbitrarycode via the -g option of the CleanNode() function in gdoc.c.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libtidy58 Ubuntu 25.04 (plucky) | 2:5.6.0-11ubuntu1 | [libtidy58 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libtidy58-2-5.6.0-11ubuntu1.md) | Jan 16, 2026 |
| Linux | libtidy5deb1 Ubuntu 20.04 LTS (focal) | 2:5.6.0-11ubuntu0.20.04.1 | [libtidy5deb1 2:5.6.0-11ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtidy5deb1-2-5.6.0-11ubuntu0.20.04.1.md) | Feb 17, 2023 |
| Linux | libtidy5deb1 Ubuntu 22.04.1 LTS (jammy) | 2:5.6.0-11ubuntu0.22.04.1 | [libtidy5deb1 2:5.6.0-11ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libtidy5deb1-2-5.6.0-11ubuntu0.22.04.1.md) | Feb 17, 2023 |
| Linux | libtidy5deb1 Ubuntu 24.04.5 LTS (noble) | 2:5.6.0-11ubuntu1 | [libtidy5deb1 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libtidy5deb1-2-5.6.0-11ubuntu1.md) | Feb 17, 2023 |
| Linux | libtidy5deb1 Ubuntu 24.10 (oracular) | 2:5.6.0-11ubuntu1 | [libtidy5deb1 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libtidy5deb1-2-5.6.0-11ubuntu1.md) | Jan 16, 2026 |
| Linux | tidy Ubuntu 20.04 LTS (focal) | 2:5.6.0-11ubuntu0.20.04.1 | [tidy 2:5.6.0-11ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tidy-2-5.6.0-11ubuntu0.20.04.1.md) | Feb 17, 2023 |
| Linux | tidy Ubuntu 22.04.1 LTS (jammy) | 2:5.6.0-11ubuntu0.22.04.1 | [tidy 2:5.6.0-11ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-tidy-2-5.6.0-11ubuntu0.22.04.1.md) | Feb 17, 2023 |
| Linux | tidy Ubuntu 24.04.5 LTS (noble) | 2:5.6.0-11ubuntu1 | [tidy 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-tidy-2-5.6.0-11ubuntu1.md) | Feb 17, 2023 |
| Linux | tidy Ubuntu 24.10 (oracular) | 2:5.6.0-11ubuntu1 | [tidy 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-tidy-2-5.6.0-11ubuntu1.md) | Jan 16, 2026 |
| Linux | tidy Ubuntu 25.04 (plucky) | 2:5.6.0-11ubuntu1 | [tidy 2:5.6.0-11ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-tidy-2-5.6.0-11ubuntu1.md) | Jan 16, 2026 |
| Linux | tidy-html5 Debian 13.5 (trixie) | 2:5.8.0-2 | [DEBIAN-CVE-2021-33391](https://patchblox.com/security/data/fix/linux/debian-cve-2021-33391.md) | Feb 17, 2023 |
| Linux | tidy-html5 Debian 14 | 2:5.8.0-2 | [DEBIAN-CVE-2021-33391](https://patchblox.com/security/data/fix/linux/debian-cve-2021-33391.md) | Feb 17, 2023 |

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Data as of 2026-11-09T01:18:40Z 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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