Deserialization in Fontforge
CVE-2025-15276
FontForge SFD File Parsing Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of SFD files. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28198.
Vulnerability class: Insecure Deserialization
EPSS: 0.003 (25.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Fontforge — versions 836f4e11e4cb890353393b36c0465ef445e0c4d4, 20251009
Weakness classification (CWE)
Public proof-of-concept exploits
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-15276?
- CVE-2025-15276 is a high-severity vulnerability in Fontforge, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2025-12-31.
- How severe is CVE-2025-15276?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-15276 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.