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CVE-2026-121753 Ashlar-Vellum Cobalt XE File Parsing Use-After-Free Remote Code Execution Vulnerability

7.8 highEPSS 0.2%

High (7.8) in ashlar-vellum cobalt. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

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Ashlar-Vellum Cobalt XE File Parsing Use-After-Free 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 validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28587.

Severity

CVSS 3.0

7.8 high
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 12th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-416 Use After Free
Published
Modified
Assigned by
zdi (CNA)
NVD analysis
Deferred: the NVD does not plan to analyze it
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
Ashlar-Vellum Cobalt1204.207

History

  1. The NVD deferred its analysis

Changes since this site first stored the record. The same for every record: /api/public/changes.

References

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