CVE-2023-39427: Ashlar-Vellum Cobalt, Xenon, Argon, Lithium Out-of-bounds Write

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-26 · updated 2026-06-17
Weakness: CWE-787

Description

In Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, and Cobalt Share v12 SP0 Build (1204.77), the affected applications lack proper validation of user-supplied data when parsing XE files. This could lead to an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process.

Affected products

Ashlar-Vellum Argon: before 12.4.1204.200 — fixed in 12.4.1204.200
Ashlar-Vellum Cobalt: before 12.4.1204.200 — fixed in 12.4.1204.200
Ashlar-Vellum Graphite: through 13.0.48
Ashlar-Vellum Lithium: before 12.4.1204.200 — fixed in 12.4.1204.200
Ashlar-Vellum Xenon: before 12.4.1204.200 — fixed in 12.4.1204.200

How to fix

Upgrade to a fixed version: Ashlar-Vellum Argon 12.4.1204.200; Ashlar-Vellum Cobalt 12.4.1204.200; Ashlar-Vellum Lithium 12.4.1204.200; Ashlar-Vellum Xenon 12.4.1204.200. Check the vendor advisory for mitigations.

References

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