CVE-2026-108443
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
An off-by-one error in Microsoft Office Word allows an unauthorized attacker to execute code over a network. The flaw stems from an incorrect buffer size calculation by one byte.
Risk Assessment
An attacker can remotely execute arbitrary code in the context of the user opening a malicious document, potentially leading to full workstation compromise.
Recommendation
Apply the Microsoft security update for Office Word as soon as possible and avoid opening documents from untrusted sources.
Other vulnerabilities in Microsoft Office Word
See all- CVE-2026-20948High
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
- CVE-2026-20944High
An out-of-bounds read vulnerability in Microsoft Office Word allows an unauthorized attacker to execute code locally.
- CVE-2026-70300Critical
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
- CVE-2026-40364High
In Microsoft Office Word, a vulnerability related to access of resource using incompatible type ('type confusion') allows an unauthorized attacker to execute code locally.
- CVE-2026-108451High
A numeric truncation error in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. The flaw stems from improper handling of numeric values.
- CVE-2026-108450High
A heap-based buffer overflow in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. The vulnerability occurs when processing specially crafted data.
- CVE-2026-108449High
A heap-based buffer overflow in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. The vulnerability occurs when processing specially crafted data.
- CVE-2026-108447High
A heap-based buffer overflow in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. The vulnerability occurs when processing specially crafted data.
- CVE-2026-108445High
A stack-based buffer overflow in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. The vulnerability occurs when processing specially crafted data.
- CVE-2026-108442High
A use-after-free vulnerability in Microsoft Office Word allows an unauthorized attacker to execute code over a network. The flaw involves accessing memory after it has been freed.
Original NVD description (English source)
Off-by-one error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS