EUVD-2026-79134
GHSA-j5q8-xg6p-pm2j
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Delivery is a local file the victim must open in Cobalt, so AV:L with UI:R; parsing needs no credentials (PR:N) and yields full code execution.
Primary rating from Vendor (zdi).
CVSS VectorVendor: zdi
Lifecycle Timeline
2DescriptionCVE.org
Ashlar-Vellum Cobalt VS 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 VS 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. Was ZDI-CAN-28173.
AnalysisAI
Heap-based buffer overflow in Ashlar-Vellum Cobalt during parsing of VS drawing files allows an attacker to execute arbitrary code in the context of the victim's process. Exploitation requires the target to open a crafted VS file (user interaction), and no authentication or server-side access is needed because the flaw sits in the file parser. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the victim to open a crafted VS file in an affected Ashlar-Vellum Cobalt installation - the flaw is in the local file parser, and CVSS AV:L with UI:R confirms the file-open interaction is mandatory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 3.1 base 7.8 with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H describes a file-parser memory corruption: low complexity, no privileges, no scope change, full C/I/A impact, but gated behind user interaction and a local delivery model (the victim must open the file). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch or fixed version is identified in the supplied data; the authoritative tracking item is the ZDI advisory https://www.zerodayinitiative.com/advisories/ZDI-26-587/, and Ashlar-Vellum should be contacted for a patched Cobalt build and an affected-version statement. … Detailed patch versions, workarounds, and compensating controls in full report. |
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An Out-of-Bounds Write vulnerability is present in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, and Cobalt Share version
In Ashlar-Vellum Cobalt versions prior to v12 SP2 Build (1204.200), the affected application lacks proper validation of
A Heap-based Buffer Overflow vulnerability is present in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, and Cobalt Share v
In Ashlar-Vellum Cobalt versions prior to v12 SP2 Build (1204.200), the affected application lacks proper validation of
Arbitrary code execution and information disclosure in the Ashlar-Vellum CAD/3D-modeling suite (Cobalt, Xenon, Argon, Li
Arbitrary code execution and information disclosure in Ashlar-Vellum's CAD suite (Cobalt, Xenon, Argon, Lithium, and Cob
Arbitrary code execution in the Ashlar-Vellum CAD suite (Cobalt, Xenon, Argon, Lithium, and Cobalt Share, versions 12.6.
Ashlar-Vellum Cobalt XE File Parsing Type Confusion Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8),
Ashlar-Vellum Cobalt XE File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. Rated high severity (CVSS
Ashlar-Vellum Cobalt CO File Parsing Type Confusion Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8),
Ashlar-Vellum Cobalt CO File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. Rated high severity (CVSS
Ashlar-Vellum Cobalt AR File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. Rated high severit
Same weakness CWE-122 – Heap-based Buffer Overflow
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External POC / Exploit Code
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