Heap-based buffer overflow in LibreOffice - CVE-2026-6039
Published: June 17, 2026
Vulnerability identifier: #VU134746
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-6039
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreOffice
Affected software:
LibreOffice
LibreOffice
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in DXF polyline import when parsing a crafted DXF file. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
The issue occurs when a polyline point count exceeds the 16-bit range, causing the buffer to be sized using a truncated value while writes use the full count.
How to mitigate CVE-2026-6039
Install security update from vendor's website.