Out-of-bounds write in unrtf - CVE-2026-109831
Published: October 20, 2026
Vulnerability identifier: #VU156202
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109831
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input. A remote attacker can create a specially crafted RTF file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and perform a denial of service (DoS) attack.
Affected software
unrtf
How to mitigate CVE-2026-109831
Install updates from vendor's website.
unrtf - update to 0.21.12