FontForge SGI File Parser heap-based overflow

Summaryinfo

A vulnerability classified as critical was found in FontForge. The impacted element is an unknown function of the component SGI File Parser. The manipulation results in heap-based overflow. This vulnerability is known as CVE-2025-15277. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in FontForge (version unknown). It has been classified as critical. Affected is an unknown function of the component SGI File Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

FontForge GUtils SGI File Parsing Heap-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 scanlines within SGI files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27920.

The advisory is available at zerodayinitiative.com. This vulnerability is traded as CVE-2025-15277. 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. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 281528 (Linux Distros Unpatched Vulnerability : CVE-2025-15277), 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 (281528) and EUVD (EUVD-2025-205889). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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• FontForge

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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