Skip to main content
CVE-2026-121752VulnerabilityPublished

ZDI-26-871: (0Day) Ashlar-Vellum Cobalt LI File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

Source Zero Day Initiative

0
Compare

Not known to be exploited.

Data as of 4 Nov 2026, 14:44 UTC

Severity
High

Rated High by Zero Day Initiative · CVSS not yet scored by NVD

Exploitation evidence

  1. Disclosed: evidence found.

    Public on cve.org; its publication date is not in this record

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

AI-suggested

Until a fix is available, users should avoid opening untrusted files or visiting untrusted web pages that could trigger this vulnerability.

Description

A heap-based buffer overflow vulnerability exists in Ashlar-Vellum Cobalt's LI file parsing functionality. This flaw allows remote attackers to execute arbitrary code if a user opens a malicious file or visits a malicious page. The vulnerability requires user interaction for exploitation. It has been assigned CVE-2026-121752 and a CVSS rating of 7.8 by the Zero Day Initiative.

References

Community reviews

Loading reviews…