CVE-2026-121744 PUBLISHED

Ashlar-Vellum Cobalt XE File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

Assigner: zdi
Reserved: 03.11.2026 Published: 12.11.2026 Updated: 12.11.2026

Ashlar-Vellum Cobalt XE File Parsing Stack-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 XE files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28172.

Metrics

CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS Score: 7.8

Product Status

Vendor Ashlar-Vellum
Product Cobalt
Versions Default: unknown
  • Version 1204.204 is affected

References

Problem Types

  • CWE-121: Stack-based Buffer Overflow CWE