CVE-2025-11463: 
NixOS vulnerability analysis and mitigation

CVE-2025-11463 is a vulnerability discovered in Ashlar-Vellum Cobalt software, specifically affecting version 12.2.1204.97. The vulnerability was reported to the vendor on April 14, 2025, and was publicly disclosed on October 16, 2025, as a zero-day vulnerability. This integer overflow vulnerability exists within the parsing of XE files and affects the software's file parsing functionality (ZDI Advisory).

The vulnerability is an integer overflow condition that occurs during the parsing of XE files in Ashlar-Vellum Cobalt. The specific flaw stems from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (High), with the following vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (ZDI Advisory).

If successfully exploited, this vulnerability allows attackers to execute arbitrary code in the context of the current process. The high CVSS score indicates severe potential impacts on system confidentiality, integrity, and availability. The vulnerability requires user interaction but can lead to complete compromise of the affected system (ZDI Advisory).

According to the Zero Day Initiative, the only salient mitigation strategy is to restrict interaction with the product. The vendor communicated that a fix would be available in an upcoming update as of October 6, 2025 (ZDI Advisory).