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.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7917-1 advisory.

    It was discovered that the subsetting module of fontTools was vulnerable to an XML External Entity (XEE)     attack. An unauthenticated remote attacker could possibly use this issue to include arbitrary files from     the file system or make web requests from the host system. This issue only

    affected Ubuntu 22.04 LTS. (CVE-2023-45139)

    It was discovered that fontTools was vulnerable to path traversal attacks. If a user or automated system     were tricked into extracting a specially crafted .designspace file, an attacker could possibly use this     issue to write arbitrary files outside the target directory, resulting in remote code execution. This     issue only affected Ubuntu 24.04 LTS, Ubuntu 25.04 and Ubuntu 25.10. (CVE-2025-66034)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2024:0368 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2023-45139:
    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 7.02, has fonttools packages installed that are affected by a vulnerability:

  - 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. (CVE-2023-45139)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2023-45139)

The remote Fedora 39 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-6d1d9f70d2 advisory.

    Security fix for CVE-2023-45139

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
278076	Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : fontTools vulnerabilities (USN-7917-1)	Nessus	Ubuntu Local Security Checks	Local	critical
276392	TencentOS Server 4: fonttools (TSSA-2024:0368)	Nessus	Tencent Local Security Checks	Local	high
242717	NewStart CGSL MAIN 7.02 : fonttools Vulnerability (NS-SA-2025-0156)	Nessus	NewStart CGSL Local Security Checks	Local	high
411234	SCA: security update for fonttools (GHSA-6673-4983-2vx5)	Tenable Cloud Security	SCA Checks	Local	high
411234	SCA: security update for fonttools (GHSA-6673-4983-2vx5)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
189483	Fedora 39 : fonttools (2024-6d1d9f70d2)	Nessus	Fedora Local Security Checks	Local	high

Detections

Analytics

CVE-2023-45139

high

Tenable Plugins

critical

high

high

high

high

high