SB2026090931 - Remote code execution in Windows Graphics component
Published: September 9, 2026
Security Bulletin ID
SB2026090931
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-81955)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 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]
The vulnerability allows a remote attacker to execute code.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Graphics Component when processing a specially crafted RTF file in Microsoft Word. A remote attacker can send a specially crafted RTF file and convince a user to open it in Microsoft Word and save it as a filtered web page to execute code.
The Preview Pane is not an attack vector.
Remediation
Install update from vendor's website.