Quick answers
- Is CVE-2026-121744 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121744 being exploited in the wild.
- How severe is CVE-2026-121744?
- High severity, with a CVSS score of 7.8, published 12 November 2026.
- Which products and versions are affected?
- Ashlar-Vellum Cobalt.
- Is there a fix for CVE-2026-121744?
- No fixed version is recorded yet. Restrict user interaction with untrusted XE files and avoid opening files from untrusted sources until a patch is available. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-121744 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-121744?
- Check whether you run Ashlar-Vellum Cobalt. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
Restrict user interaction with untrusted XE files and avoid opening files from untrusted sources until a patch is available.
Technical details
The vulnerability is a stack-based buffer overflow in Cobalt's XE file parsing routine, caused by insufficient validation of user-supplied data length before copying to a stack buffer. User interaction is required—the target must open a malicious XE file or visit a malicious page triggering file download. An attacker gains arbitrary code execution in the context of the Cobalt process.
Affected products
- Ashlar-Vellum Cobalt
Timeline
- 2025-11-11: disclosed
- 2026-11-04: advisory