Out-Of-Bounds Read Vulnerability in Ashlar-Vellum Cobalt Product
CVE-2025-7991

7.8HIGH

Key Information:

Vendor

Ashlar-vellum

Status
Cobalt
Vendor
CVE Published:
17 September 2025

What is CVE-2025-7991?

This vulnerability in Ashlar-Vellum Cobalt allows remote attackers to execute arbitrary code due to improper validation of user-supplied VC6 file data. The parsing flaw permits access beyond the allocated boundaries of a data structure, which can be exploited when a user visits a malicious webpage or opens a compromised file. This vulnerability represents a potential risk for users of the affected Cobalt product, necessitating awareness and prompt response to mitigate associated threats.

Affected Version(s)

Cobalt 12 SP1

References

https://www.zerodayinitiative.com/advisories/ZDI-25-643/
x_research-advisory

CVSS V3.0

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-7991 : Out-Of-Bounds Read Vulnerability in Ashlar-Vellum Cobalt Product