# CVE-2016-0718: Python 3.5 and 1 other: Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary…

CVE-2016-0718 is fixed in 6 products on 2 platforms, first by Python 3.6 3.6.2, released July 17, 2017. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2016-0718
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.1326
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 17, 2016
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2016-0718

## Description

Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.5 | 3.5.4 | [Python 3.5 3.5.4](https://patchblox.com/security/data/fix/windows-app/python.python.3.5-3.5.4.md) | Aug 7, 2017 |
| Windows apps | Python 3.6 | 3.6.2 | [Python 3.6 3.6.2](https://patchblox.com/security/data/fix/windows-app/python.python.3.6-3.6.2.md) | Jul 17, 2017 |
| Linux | expat Ubuntu 24.10 (oracular) | 2.1.1-1ubuntu1 | [expat 2.1.1-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-expat-2.1.1-1ubuntu1.md) | Jan 16, 2026 |
| Linux | expat Ubuntu 25.04 (plucky) | 2.1.1-1ubuntu1 | [expat 2.1.1-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-expat-2.1.1-1ubuntu1.md) | Jan 16, 2026 |
| Linux | expat sles 15.6 | 2.8.5-150400.3.40.1 | [SUSE-SU-2026:4623-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4623-1.md) | Nov 7, 2026 |
| Linux | libexpat1 Ubuntu 24.10 (oracular) | 2.1.1-1ubuntu1 | [libexpat1 2.1.1-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libexpat1-2.1.1-1ubuntu1.md) | Jan 16, 2026 |
| Linux | libexpat1 Ubuntu 25.04 (plucky) | 2.1.1-1ubuntu1 | [libexpat1 2.1.1-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libexpat1-2.1.1-1ubuntu1.md) | Jan 16, 2026 |
| Linux | libxmltok1 Ubuntu 18.04.6 LTS (bionic) | 1.2-4ubuntu0.18.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.18.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxmltok1-1.2-4ubuntu0.18.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1 Ubuntu 20.04 LTS (focal) | 1.2-4ubuntu0.20.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.20.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxmltok1-1.2-4ubuntu0.20.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1 Ubuntu 22.04.1 LTS (jammy) | 1.2-4ubuntu0.22.04.1~esm4 | [libxmltok1 1.2-4ubuntu0.22.04.1~esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxmltok1-1.2-4ubuntu0.22.04.1-esm4.md) | Jan 10, 2022 |
| Linux | libxmltok1t64 Ubuntu 24.04.5 LTS (noble) | 1.2-4.1ubuntu2.24.0.4.1+esm2 | [libxmltok1t64 1.2-4.1ubuntu2.24.0.4.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxmltok1t64-1.2-4.1ubuntu2.24.0.4.1-esm2.md) | Jan 10, 2022 |
| Linux | libxmltok1t64 Ubuntu 24.10 (oracular) | 1.2-4.1ubuntu3.1 | [libxmltok1t64 1.2-4.1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libxmltok1t64-1.2-4.1ubuntu3.1.md) | Sep 4, 2019 |

---

Data as of 2026-11-07T18:46:35Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.