COBALT · CVE-2026-121753 · Other
NO FIX YET · SEE WHAT TO DO
Ashlar-Vellum Cobalt mishandles an object reference while parsing XE files, a use-after-free flaw. An attacker who gets a user to open a malicious file or visit a malicious page can run code in the context of the Cobalt process.
first public Nov 12, 2026 · 2 sources
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Anyone who runs Ashlar-Vellum Cobalt (CAD software) and opens XE files from outside sources. Exploitation needs the user to open a malicious file or visit a malicious page. Teams that do not use Cobalt can skip it.
Not affected if unknown
Who cares ashlar-vellum, cad, cobalt, desktop, no-fix, use-after-free, user-interaction
Ashlar-Vellum Cobalt XE 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 XE 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. Was ZDI-CAN-28587.
This page as .md · .json · CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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