CVE-2026-77493

CVE-2026-77493 is a critical-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-415.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 1% (60th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-415
• Affected product: Microsoft Windows 10 1607
• Published: 2026-09-08
• Last modified: 2026-09-10

Description

Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-77493?

Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

How severe is CVE-2026-77493?

CVE-2026-77493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-77493 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-77493?

CVE-2026-77493 primarily affects Microsoft Windows 10 1607. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-77493?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-77493 published?

CVE-2026-77493 was published on 2026-09-08 and last updated on 2026-09-10.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77493

Affected products (24)

• cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows 10 1607

• CVE-2026-57092 — Critical (CVSS 9.9): Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a network.
• CVE-2026-73025 — Critical (CVSS 9.8): Weak authentication in Windows iSCSI allows an unauthorized attacker to bypass a security feature over a network.
• CVE-2026-73009 — Critical (CVSS 9.8): Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over…
• CVE-2026-72979 — Critical (CVSS 9.8): Use after free in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
• CVE-2026-70296 — Critical (CVSS 9.8): Out-of-bounds write in Windows Imaging Component allows an unauthorized attacker to execute code over a network.
• CVE-2026-69910 — Critical (CVSS 9.8): Stack-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code over a network.

All CVEs affecting Microsoft Windows 10 1607 →

Other CWE-415 (Double Free) vulnerabilities

• CVE-2018-0101 — Critical (CVSS 10.0): A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA)…
• CVE-2026-84561 — Critical (CVSS 9.8): A double free issue was addressed with improved memory management. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS…
• CVE-2026-64387 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay…
• CVE-2026-64386 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_info() replay…
• CVE-2026-64385 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_ioctl()…
• CVE-2026-64384 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay…

Browse all CWE-415 (Double Free) vulnerabilities →