CVE-2023-45139 — fontTools is a library for manipulating fonts, written in Python

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

01What is this 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…

02Affected products

Vendor	Product	Versions
fonttools	fonttools	>= 4.28.2, < 4.43.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-01-10T16:03:08.770Z
• Last modified: 2025-06-03T14:27:45.728Z

09References

• github.com — https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5
• github.com — https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9…
• github.com — https://github.com/fonttools/fonttools/releases/tag/4.43.0
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/03/09/1
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/03/08/2