Vulnerability · Published Dec 31, 2025 · Assigned by zdi
CVE-2025-15276FontForge SFD File Parsing Deserialization of Untrusted Data Remote Code Execution Vulnerability
High 7.8
In plain English
A high-severity unsafe deserialization in FontForge from FontForge. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | fontforge | no fix listed | DEBIAN-CVE-2025-15276 |
| Debian:13 | fontforge | no fix listed | DEBIAN-CVE-2025-15276 |
| Debian:14 | fontforge | no fix listed | DEBIAN-CVE-2025-15276 |
| Ubuntu:22.04:LTS | fontforge | no fix listed | UBUNTU-CVE-2025-15276 |
| Ubuntu:24.04:LTS | fontforge | no fix listed | UBUNTU-CVE-2025-15276 |
| Ubuntu:25.10 | fontforge | no fix listed | UBUNTU-CVE-2025-15276 |
| Ubuntu:26.04:LTS | fontforge | no fix listed | UBUNTU-CVE-2025-15276 |
| Ubuntu:26.10 | fontforge | no fix listed | UBUNTU-CVE-2025-15276 |
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- ZDI-25-1187 x_research-advisory