TI-2026-16043 Aliases CVE-2026-19781 GHSA-j5q8-xg6p-pm2j

Heap-based buffer overflow in Ashlar-Vellum Cobalt

LOW 36CWE-122Published 2026-09-15 · Updated 2026-09-15

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

Ashlar-Vellum Cobalt VS File Parsing Heap-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 VS files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28173.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00232 14th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Ashlar-Vellum	Cobalt	1204.204	—	No fix listed	CNA

Cobalt VendorAshlar-Vellum Affected 1204.204 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:ashlar:cobalt::::::::	—	—	Ashlar-Vellum

cpe:2.3:a:ashlar:cobalt:*:*:*:*:*:*:*:* Versions — — ·Ashlar-Vellum

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-19781
2026-10-03 Alias added: GHSA-j5q8-xg6p-pm2j

References

Other 1

ZDI-26-587

TI-2023-23946 Uncontrolled search path in Ashlar-Vellum Lithium CVSS 3.1HIGH 8.8
TI-2023-23945 Uncontrolled search path in Ashlar-Vellum Xenon CVSS 3.1HIGH 8.8
TI-2023-23944 Uncontrolled search path in Ashlar-Vellum Argon CVSS 3.1HIGH 8.8
TI-2023-17142 Out-of-bounds write in Ashlar-Vellum Graphite CVSS 3.1HIGH 8.8
TI-2023-17141 Out-of-bounds write in Ashlar-Vellum Graphite CVSS 3.1HIGH 8.8
TI-2023-17140 Stack-based buffer overflow in Ashlar-Vellum Graphite CVSS 3.1HIGH 8.8

See all 104 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences