ZDI-CAN-26631: ZDI-25-956: (0Day) Ashlar-Vellum Cobalt CO File Parsing Use-After-Free Remote Code Execution Vulnerability
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. 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 CO files. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.
Other sources
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2025-11465.
— ZDI
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-CAN-26631?
The severity of ZDI-CAN-26631 is high due to its potential for remote code execution.
How do I fix ZDI-CAN-26631?
To fix ZDI-CAN-26631, update your Ashlar-Vellum Cobalt to the latest version provided by the vendor.
What are the risks of ZDI-CAN-26631 if left unpatched?
If left unpatched, ZDI-CAN-26631 could allow attackers to execute arbitrary code, compromising system integrity and data security.
What systems are affected by ZDI-CAN-26631?
ZDI-CAN-26631 affects installations of Ashlar-Vellum Cobalt that have not been updated to mitigate the vulnerability.
Is user interaction required to exploit ZDI-CAN-26631?
Yes, user interaction is required to exploit ZDI-CAN-26631 by visiting a malicious page or opening a malicious file.