CVE-2025-7987: 
NixOS vulnerability analysis and mitigation

The vulnerability (CVE-2025-7987) affects Ashlar-Vellum Graphite software and was discovered by Rocco Calvi (@TecR0c) with TecSecurity. The vulnerability was reported to the vendor on December 19, 2024, and was publicly disclosed as a zero-day on July 22, 2025. This vulnerability affects the parsing of VC6 files in Ashlar-Vellum Graphite and has been assigned a CVSS score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) (ZDI Advisory).

The vulnerability exists within the parsing of VC6 files in Ashlar-Vellum Graphite. The specific flaw results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. The vulnerability has been assigned a CVSS score of 7.8, indicating a high severity level (ZDI Advisory).

A successful exploitation of this vulnerability allows attackers to execute arbitrary code in the context of the current process. The high CVSS score indicates that successful exploitation could lead to significant system compromise, potentially affecting the confidentiality, integrity, and availability of the system (ZDI Advisory).

Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the product. As of the disclosure date, no official patches were available from the vendor (ZDI Advisory).