--- title: "CVE-2026-43856: FileProcess - Buffer Overflow" description: "FileProcess contains a stack-based buffer overflow caused by improper handling of paths longer than 1024 bytes in CheckDir function, letting remote authenticated attackers execute arbitrary code." url: https://panop.io/threat-heartbeat/CVE-2026-43856/ --- # CVE-2026-43856 FileProcess - Buffer Overflow FileProcess contains a stack-based buffer overflow caused by improper handling of paths longer than 1024 bytes in CheckDir function, letting remote authenticated attackers execute arbitrary code. CVSS base score 8.6 /10 High CISA KEV Not listed Public exploit None known Authentication Required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-43856) ## Details Type Buffer Overflow Impact Remote Code Execution CVSS vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 20 October 2026 Updated 20 October 2026 ## Vendor fix Update to the latest version with the buffer overflow fix. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-43856](https://nvd.nist.gov/vuln/detail/CVE-2026-43856) - [https://www.advantech.com/en/security-advisory](https://www.advantech.com/en/security-advisory) - [https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149](https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)