CVE catalog
CVE-2025-66034
fontTools vulnerabilities
- Severity
- Medium · CVSS 6.3
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.55% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | fonttools | sid | 4.65.0-1 | fixed |
| Debian | fonttools | forky | 4.65.0-1 | fixed |
| Debian | fonttools | trixie | 4.57.0-1+deb13u1 | fixed |
| Debian | fonttools | bookworm | 4.38.0-1+deb12u1 | fixed |
| Ubuntu | fonttools | noble | 4.46.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | python-fonttools-doc | noble | 4.46.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | python3-fonttools | noble | 4.46.0-1ubuntu0.1~esm1 | fixed |
| PyPI | fonttools | Not reported | 4.60.2 | fixed |
| Cpe | fonttools | Not reported | 4.60.2 | fixed |
| Ubuntu | fonttools | pro | 4.38.0-1build1 | vulnerable |
| Ubuntu | fonttools | pro | 4.38.0-1build2 | vulnerable |
| Ubuntu | fonttools | pro | 4.46.0-1 | vulnerable |
| Ubuntu | fonttools | pro | 4.46.0-1build2 | vulnerable |
| Ubuntu | fonttools | pro | 4.46.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | fonttools | 25.10 | 4.55.3-2build1 | vulnerable |
| Ubuntu | fonttools | 25.10 | 4.55.3-2ubuntu0.25.10.1 | fixed |
| Ubuntu | fonttools | 26.04 | 4.55.3-2build1 | vulnerable |
| Ubuntu | fonttools | 26.04 | 4.57.0-1 | vulnerable |
| Ubuntu | fonttools | 26.04 | 4.57.0-2build1 | vulnerable |
| Ubuntu | fonttools | 26.04 | 4.57.0-3 | vulnerable |
| Ubuntu | fonttools | 26.04 | 4.57.0-3ubuntu1 | fixed |
| Opensuse | python-FontTools | leap 16.0 | 4.53.1-160000.3.1 | fixed |
| Opensuse | python-FontTools | tumbleweed | 4.61.1-1.1 | fixed |
| Suse | python-FontTools | linux enterprise server 16.0 | 4.53.1-160000.3.1 | fixed |
| Suse | python-FontTools | linux enterprise server for sap applications 16.0 | 4.53.1-160000.3.1 | fixed |
| Suse | python-FontTools | linux enterprise module for package hub 15 sp7 | 4.47.2-150600.3.3.1 | fixed |
| Opensuse | python-FontTools | leap 15.6 | 4.47.2-150600.3.3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fonttools | source | sid | 4.61.1-1 | not yet assigned | Not reported | [1121605] |
| Debian | fonttools | source | forky | 4.61.1-1 | not yet assigned | Not reported | [1121605] |
| Debian | fonttools | source | trixie | 4.57.0-1+deb13u1 | not yet assigned | Not reported | [1121605] |
| Debian | fonttools | source | bookworm | 4.38.0-1+deb12u1 | not yet assigned | Not reported | [1121605] |
| Ubuntu | fonttools | deb | noble | 4.46.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | python-fonttools-doc | deb | noble | 4.46.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | python3-fonttools | deb | noble | 4.46.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| PyPI | fonttools | PyPI | Not reported | 4.60.2 | Not reported | GHSA-768J-98CG-P3FV | Not reported |
| Cpe | fonttools | cpe | Not reported | 4.60.2 | Not reported | NVD-CVE-2025-66034 | Not reported |
| Ubuntu | fonttools | deb | pro | 4.46.0-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2025-66034 | Not reported |
| Ubuntu | fonttools | deb | 25.10 | 4.55.3-2ubuntu0.25.10.1 | Not reported | UBUNTU-CVE-2025-66034 | Not reported |
| Ubuntu | fonttools | deb | 26.04 | 4.57.0-3ubuntu1 | Not reported | UBUNTU-CVE-2025-66034 | Not reported |
| Opensuse | python-FontTools | rpm | leap 16.0 | 4.53.1-160000.3.1 | Not reported | OPENSUSE-SU-2026:20119-1 | Not reported |
| Opensuse | python-FontTools | rpm | tumbleweed | 4.61.1-1.1 | Not reported | OPENSUSE-SU-2026:10076-1 | Not reported |
| Suse | python-FontTools | rpm | linux enterprise server 16.0 | 4.53.1-160000.3.1 | Not reported | SUSE-SU-2026:20184-1 | Not reported |
| Suse | python-FontTools | rpm | linux enterprise server for sap applications 16.0 | 4.53.1-160000.3.1 | Not reported | SUSE-SU-2026:20184-1 | Not reported |
| Suse | python-FontTools | rpm | linux enterprise module for package hub 15 sp7 | 4.47.2-150600.3.3.1 | Not reported | SUSE-SU-2026:0199-1 | Not reported |
| Opensuse | python-FontTools | rpm | leap 15.6 | 4.47.2-150600.3.3.1 | Not reported | SUSE-SU-2026:0199-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-FontTools]Unknown
Source package: [python-FontTools]
Details (1)
4.62.1-1.3· noarch · tumbleweedUnknown · Fixed:
4.61.1-1.1Version impact unknown
usn · python-FontTools · opensuse · tumbleweed
- [python314-FontTools]Unknown
Source package: [python-FontTools]
Details (1)
4.62.1-1.3· noarch · tumbleweedUnknown · Fixed:
4.61.1-1.1Version impact unknown
usn · python-FontTools · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [fonttools]Fixed
Details (2)
4.38.0-1+deb12u1· all · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
4.38.0-1+deb12u1· all · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
- [python3-fonttools]Fixed
Source package: [fonttools]
Details (2)
4.38.0-1+deb12u1· amd64 · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
4.38.0-1+deb12u1· arm64 · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
- [python-fonttools-doc]Fixed
Source package: [fonttools]
Details (2)
4.38.0-1+deb12u1· all · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
4.38.0-1+deb12u1· all · bookwormFixed · Fixed:
4.38.0-1+deb12u1usn · fonttools · debian · bookworm; usn · fonttools · debian · 12
[Debian 13 (Trixie)]
- [fonttools]Fixed
Details (2)
4.57.0-1+deb13u1· all · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
4.57.0-1+deb13u1· all · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
- [python3-fonttools]Fixed
Source package: [fonttools]
Details (2)
4.57.0-1+deb13u1· amd64 · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
4.57.0-1+deb13u1· arm64 · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
- [python-fonttools-doc]Fixed
Source package: [fonttools]
Details (2)
4.57.0-1+deb13u1· all · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
4.57.0-1+deb13u1· all · trixieFixed · Fixed:
4.57.0-1+deb13u1usn · fonttools · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2025-66034]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2025-66034]
- [https://osv.dev/vulnerability/GHSA-768j-98cg-p3fv]
- [https://osv.dev/vulnerability/SUSE-SU-2026:0199-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:20184-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-66034]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10076-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20119-1]
- [https://security-tracker.debian.org/tracker/CVE-2025-66034]
- [https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-66034.json]
- [https://ubuntu.com/security/notices/USN-7917-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2189.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]