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Vulnerability record · CVE-2023-45139 · published 10 January 2024

CVE-2023-45139: Fonttools xml external entity (xxe) vulnerability

Fonttools · Fonttools

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.

7.5 CVSS 3.1 High EPSS 1.2% · top 32.1% CWE-611 · XML external entity (XXE)
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2024/03/08/2
http://www.openwall.com/lists/oss-security/2024/03/09/1
https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c Patch
https://github.com/fonttools/fonttools/releases/tag/4.43.0 Release Notes
https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5 ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/VY63B4SGY4QOQGUXMECRGD6K3
http://www.openwall.com/lists/oss-security/2024/03/08/2
http://www.openwall.com/lists/oss-security/2024/03/09/1
https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c Patch
https://github.com/fonttools/fonttools/releases/tag/4.43.0 Release Notes
https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5 ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/VY63B4SGY4QOQGUXMECRGD6K3

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-45139), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.