CVE-2025-15273 FontForge PFB File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

High 8.8 Published 31 Dec 2025 Updated 31 Dec 2025

Remote attackers can execute arbitrary code by tricking users into opening malicious PFB files in FontForge due to a stack-based buffer overflow.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-15273?

CVE-2025-15273 is a high-severity memory corruption vulnerability in FontForge, published on 31 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

FontForge PFB File Parsing Stack-based Buffer Overflow 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 PFB files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current user. Was ZDI-CAN-28546.

Weakness: CWE-121

Which versions are affected by CVE-2025-15273?

It affects 1 product.

Products include Fontforge Fontforge.

How do I fix CVE-2025-15273?

No fix has been published for CVE-2025-15273 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-15273 being exploited?

There is no known exploitation of CVE-2025-15273 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2025-15273, GHSA-w327-296g-78wc, UBUNTU-CVE-2025-15273.