CVE-2026-69764: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a net
50
This month
HIGH 8.8WATCHLISTMITIGATEMITIGATEMITIGATE
CVE-2026-69764 is a high-severity flaw (CVSS 8.8) affecting 365 apps, office 2016, office 2019. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Why this priority
High severity
On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft word DOWNGRADE
Affected: 2016
Fixed in: no fixed release known
Safe to downgrade to: a release before 2016
1. Check installed version
apt-cache policy word || rpm -q word || word --version
2. No fixed release: DOWNGRADE to a release before 2016 (Debian / Ubuntu)
apt-cache madison word
sudo apt install word=<VERSION_BEFORE_2016>
sudo apt-mark hold word
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list word
sudo dnf downgrade word-<VERSION_BEFORE_2016>
sudo dnf versionlock add word
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-69764?
365 apps: mitigate or apply the listed mitigation; office 2016: mitigate or apply the listed mitigation; office 2019: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-69764 being exploited?
CVE-2026-69764 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-69764 affect?
CVE-2026-69764 affects 365 apps, office 2016, office 2019. Severity is high (CVSS 8.8). Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
PatchTheCVE