Stack-based Buffer Overflow Vulnerability in Ashlar-Vellum Cobalt XE
CVE-2026-121744

7.8HIGH

Key Information:

Vendor

Ashlar-vellum

Status
Cobalt
Vendor
CVE Published:
12 November 2026

What is CVE-2026-121744?

A stack-based buffer overflow in the file parsing mechanism of Ashlar-Vellum Cobalt XE allows remote attackers to execute arbitrary code. This flaw arises from inadequate validation of user-supplied data length before it is copied to a stack-based buffer, making it susceptible to exploitation when a user interacts with malicious files or web pages. Effective measures should be taken to mitigate risks associated with this vulnerability.

Affected Version(s)

Cobalt 1204.204

References

https://www.zerodayinitiative.com/advisories/ZDI-26-870/
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

.