ZDI-CAN-26628: ZDI-25-955: (0Day) Ashlar-Vellum Cobalt CO File Parsing Heap-based Buffer Overflow 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 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.
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-2025-11464.
— ZDI
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-CAN-26628?
The severity of ZDI-CAN-26628 is critical due to the potential for remote code execution.
How do I fix ZDI-CAN-26628?
To fix ZDI-CAN-26628, ensure that you apply the latest security updates provided for Ashlar-Vellum Cobalt.
What type of attack does ZDI-CAN-26628 facilitate?
ZDI-CAN-26628 facilitates remote code execution attacks that require user interaction to exploit.
Which software is affected by ZDI-CAN-26628?
Ashlar-Vellum Cobalt is the affected software for vulnerability ZDI-CAN-26628.
Is user interaction required to exploit ZDI-CAN-26628?
Yes, user interaction is required as the target must visit a malicious page or open a malicious file.