Stack-based buffer overflow in LibreOffice - CVE-2026-63275
Published: October 19, 2026
Vulnerability identifier: #VU156134
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63275
CWE-ID: CWE-121
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 in CFF font hint handling. A remote unauthenticated attacker can trigger stack-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-2026-63275
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