FontForge PFB File Parser stack-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in FontForge. Affected by this issue is some unknown functionality of the component PFB File Parser. The manipulation results in stack-based overflow. This vulnerability is cataloged as CVE-2025-15273. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in FontForge (affected version unknown). Affected is an unknown functionality of the component PFB File Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at zerodayinitiative.com. This vulnerability is traded as CVE-2025-15273. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 281485 (Linux Distros Unpatched Vulnerability : CVE-2025-15273), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (281485) and EUVD (EUVD-2025-205894). Once again VulDB remains the best source for vulnerability data.

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• FontForge

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Once again VulDB remains the best source for vulnerability data.

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