Heap-based buffer overflow in LibreOffice - CVE-2026-63274
Published: October 19, 2026
Vulnerability identifier: #VU156131
CSH Severity: High
CVSS v4: 8.4 [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]
CVE-ID: CVE-2026-63274
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error. A remote attacker can trick a victim to open a specially crafted PDF file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
LibreOffice
Debian Linux
libreoffice (Debian package)
Debian Linux
libreoffice (Debian package)
How to mitigate CVE-2026-63274
Install updates from vendor's website.
LibreOffice - update to 26.2.5
libreoffice (Debian package) - update to 4:25.2.3-2+deb13u7
libreoffice (Debian package) - update to 4:25.2.3-2+deb13u7