fonttools: fontTools is a library for manipulating fonts, written in Python
CVE-2025-66034 is fixed in 3 products on 1 platform, first by fonttools 4.46.0-1ubuntu0.1~esm1, released November 28, 2025. It is not reported as exploited. Patch Radar priority: Urgent.
fontTools is a library for manipulating fonts, written in Python. In versions from 4.33.0 to before 4.60.2, the fonttools varLib (or python3 -m fontTools.varLib) script has an arbitrary file write vulnerability that leads to remote code execution when a malicious .designspace file is processed. The vulnerability affects the main() code path of fontTools.varLib, used by the fonttools varLib CLI and any code that invokes fontTools.varLib.main(). This issue has been patched in version 4.60.2.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| fonttools · Debian 12.15 (bookworm) | 4.38.0-1+deb12u1 | DEBIAN-CVE-2025-66034 | Nov 29, 2025 |
| fonttools · Debian 13.5 (trixie) | 4.57.0-1+deb13u1 | DEBIAN-CVE-2025-66034 | Nov 29, 2025 |
| fonttools · Debian 14 | 4.61.1-1 | DEBIAN-CVE-2025-66034 | Nov 29, 2025 |
| fonttools · Ubuntu 24.04.5 LTS (noble) | 4.46.0-1ubuntu0.1~esm1 | fonttools 4.46.0-1ubuntu0.1~esm1 | Nov 28, 2025 |
| fonttools · Ubuntu 25.10 (questing) | 4.55.3-2ubuntu0.25.10.1 | fonttools 4.55.3-2ubuntu0.25.10.1 | Nov 28, 2025 |
| fonttools · Ubuntu 26.04.1 LTS (resolute) | 4.57.0-3ubuntu1 | fonttools 4.57.0-3ubuntu1 | Nov 28, 2025 |
| python-FontTools · opensuse-leap 15.6 | 4.47.2-150600.3.3.1 | SUSE-SU-2026:0199-1 | Jan 21, 2026 |
| python-FontTools · opensuse-leap 16.0 | 4.53.1-160000.3.1 | OPENSUSE-SU-2026:20119-1 | Jan 28, 2026 |
| python-FontTools · sles 15.7 | 4.47.2-150600.3.3.1 | SUSE-SU-2026:0199-1 | Jan 21, 2026 |
| python-FontTools · sles 16.0 | 4.53.1-160000.3.1 | SUSE-SU-2026:20184-1 | Jan 28, 2026 |
| python3-fonttools · Ubuntu 24.04.5 LTS (noble) | 4.46.0-1ubuntu0.1~esm1 | python3-fonttools 4.46.0-1ubuntu0.1~esm1 | Nov 28, 2025 |
| python3-fonttools · Ubuntu 25.10 (questing) | 4.55.3-2ubuntu0.25.10.1 | python3-fonttools 4.55.3-2ubuntu0.25.10.1 | Nov 28, 2025 |
| python3-fonttools · Ubuntu 26.04.1 LTS (resolute) | 4.57.0-3ubuntu1 | python3-fonttools 4.57.0-3ubuntu1 | Nov 28, 2025 |
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