Ashlar-Vellum Cobalt, Xenon, Argon, Lithium Out-of-bounds Write
Priority LOW 38CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
In Ashlar-Vellum Cobalt versions prior to v12 SP2 Build (1204.200), the affected application lacks 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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00202 10th percentileScored 2026-11-07
Fix Fixed Cobalt (Ashlar-Vellum): v12 SP2 Build (1204.200)Cobalt Share (Ashlar-Vellum): v12 SP2 Build (1204.200)+3 more products
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 | before v12 SP2 Build (1204.200) | v12 SP2 Build (1204.200) | Patch available | CNA |
| Ashlar-Vellum | Cobalt Share | before v12 SP2 Build (1204.200) | v12 SP2 Build (1204.200) | Patch available | CNA |
| Ashlar-Vellum | Xenon | before v12 SP2 Build (1204.200) | v12 SP2 Build (1204.200) | Patch available | CNA |
| Ashlar-Vellum | Argon | before v12 SP2 Build (1204.200) | v12 SP2 Build (1204.200) | Patch available | CNA |
| Ashlar-Vellum | Lithium | before v12 SP2 Build (1204.200) | v12 SP2 Build (1204.200) | Patch available | CNA |
- Cobalt VendorAshlar-Vellum Affected before v12 SP2 Build (1204.200) Fixed in v12 SP2 Build (1204.200) Patch available CNA
- Cobalt Share VendorAshlar-Vellum Affected before v12 SP2 Build (1204.200) Fixed in v12 SP2 Build (1204.200) Patch available CNA
- Xenon VendorAshlar-Vellum Affected before v12 SP2 Build (1204.200) Fixed in v12 SP2 Build (1204.200) Patch available CNA
- Argon VendorAshlar-Vellum Affected before v12 SP2 Build (1204.200) Fixed in v12 SP2 Build (1204.200) Patch available CNA
- Lithium VendorAshlar-Vellum Affected before v12 SP2 Build (1204.200) Fixed in v12 SP2 Build (1204.200) Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ashlar:cobalt:*:*:*:*:*:*:*:* | before 12.4.1204.200 | Vulnerable | Ashlar-Vellum |
- cpe:2.3:a:ashlar:cobalt:*:*:*:*:*:*:*:* Versions before 12.4.1204.200 Vulnerable ·Ashlar-Vellum
Remediation
- Fix · CNA Cobalt (Ashlar-Vellum) Fixed in v12 SP2 Build (1204.200)
- Fix · CNA Cobalt Share (Ashlar-Vellum) Fixed in v12 SP2 Build (1204.200)
- Fix · CNA Xenon (Ashlar-Vellum) Fixed in v12 SP2 Build (1204.200)
- Fix · CNA Argon (Ashlar-Vellum) Fixed in v12 SP2 Build (1204.200)
- Fix · CNA Lithium (Ashlar-Vellum) Fixed in v12 SP2 Build (1204.200)
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Ashlar-Vellum Argon, Cobalt and 3 more products v12 SP2 Build (1204.200)
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2023-21092 Ashlar-Vellum Cobalt, Xenon, Argon, Lithium Heap-based Buffer OverflowPriority LOW 38
Timeline
- 2026-10-02 Threatist record created from CVE-2023-39943
- 2026-10-03 Alias added: GHSA-c2c9-4ffg-xh97
References
More Ashlar-Vellum Cobalt vulnerabilities
- TI-2023-17127 Out-of-bounds write in Ashlar-Vellum Cobalt CVSS 3.1HIGH 8.8
- TI-2025-40238 Heap-based Buffer Overflow in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
- TI-2025-40241 Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
- TI-2025-40240 Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
- TI-2025-40239 Out-of-bounds write in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
- TI-2025-40237 Out-of-bounds Write in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
Sources
- CVE-2023-39943 · CVE Program
- CVE-2023-39943 · NVD
- FIRST EPSS
- GHSA-c2c9-4ffg-xh97 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences