# CVE-2023-45139: fonttools: fontTools is a library for manipulating fonts, written in Python

CVE-2023-45139 is fixed in 2 products on 1 platform, first by fonttools 4.29.1-2ubuntu0.1~esm1, released January 10, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-45139
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0123
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 10, 2024

## Description

fontTools is a library for manipulating fonts, written in Python. The subsetting module has a XML External Entity Injection (XXE) vulnerability which allows an attacker to resolve arbitrary entities when a candidate font (OT-SVG fonts), which contains a SVG table, is parsed. This allows attackers to include arbitrary files from the filesystem fontTools is running on or make web requests from the host system. This vulnerability has been patched in version 4.43.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fonttools Debian 12.15 (bookworm) | 4.38.0-1+deb12u1 | [DEBIAN-CVE-2023-45139](https://patchblox.com/security/data/fix/linux/debian-cve-2023-45139.md) | Jan 10, 2024 |
| Linux | fonttools Debian 13.5 (trixie) | 4.46.0-1 | [DEBIAN-CVE-2023-45139](https://patchblox.com/security/data/fix/linux/debian-cve-2023-45139.md) | Jan 10, 2024 |
| Linux | fonttools Debian 14 | 4.46.0-1 | [DEBIAN-CVE-2023-45139](https://patchblox.com/security/data/fix/linux/debian-cve-2023-45139.md) | Jan 10, 2024 |
| Linux | fonttools Ubuntu 22.04.1 LTS (jammy) | 4.29.1-2ubuntu0.1~esm1 | [fonttools 4.29.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-fonttools-4.29.1-2ubuntu0.1-esm1.md) | Jan 10, 2024 |
| Linux | python3-fonttools Ubuntu 22.04.1 LTS (jammy) | 4.29.1-2ubuntu0.1~esm1 | [python3-fonttools 4.29.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-fonttools-4.29.1-2ubuntu0.1-esm1.md) | Jan 10, 2024 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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