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CVE-2026-69639: Windows 10/11 libarchive can let attackers run code remotely

CVE-2026-69639 · published 16 days ago

Summary

Certain versions of Windows 10 (1809, 21H2, 22H2) and Windows 11 (23H2, 24H2) include a flaw in the libarchive component that could let an unauthenticated network attacker execute arbitrary code. This could give the attacker control over the affected computer. Install the latest Windows updates or patches that address the libarchive issue as soon as possible.

What to do

Update microsoft windows 10 version 1809 to version 10.0.17763.9376 or later.
Update microsoft windows 10 version 21h2 to version 10.0.19044.7807 or later.
Update microsoft windows 11 version 23h2 to version 10.0.22631.7652 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.9711 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.9711 or later.
Update microsoft windows 11 version 26h1 to version 10.0.28000.3231 or later.
Update microsoft windows 11 version 26h2 to version 10.0.26300.9711 or later.
Update microsoft windows server 2019 to version 10.0.17763.9376 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9376 or later.
Update microsoft windows server 2022 to version 10.0.20348.5761 or later.
Update microsoft windows server 2025 to version 10.0.26100.33650 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33650 or later.
Update microsoft windows_10_1809 to version 10.0.17763.9376 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.7807 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.7807 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.7652 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.9711 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.9711 or later.
Update microsoft windows_11_26h1 to version 10.0.28000.3231 or later.
Update microsoft windows_11_26h2 to version 10.0.26300.9711 or later.
Update microsoft windows_server_2019 to version 10.0.17763.9376 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5761 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33650 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1809	< 10.0.17763.9376
microsoft	windows 10 version 21h2	< 10.0.19044.7807
microsoft	windows 10 version 22h2	< 10.0.19044.7807 < 10.0.19045.7807
microsoft	windows 11 version 23h2	< 10.0.22631.7652
microsoft	windows 11 version 24h2	< 10.0.26100.9711
microsoft	windows 11 version 25h2	< 10.0.26200.9711
microsoft	windows 11 version 26h1	< 10.0.28000.3231
microsoft	windows 11 version 26h2	< 10.0.26300.9711
microsoft	windows server 2019	< 10.0.17763.9376
microsoft	windows server 2019 (server core installation)	< 10.0.17763.9376
microsoft	windows server 2022	< 10.0.20348.5761
microsoft	windows server 2025	< 10.0.26100.33650
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33650
microsoft	windows_10_1809	< 10.0.17763.9376 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.7807 `cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*`
microsoft	windows_10_22h2	< 10.0.19045.7807 `cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*`
microsoft	windows_11_23h2	< 10.0.22631.7652 `cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.9711 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.9711 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h1	< 10.0.28000.3231 `cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*`
microsoft	windows_11_26h2	< 10.0.26300.9711 `cpe:2.3:o:microsoft:windows_11_26h2:::::::arm64:*`
microsoft	windows_server_2019	< 10.0.17763.9376 `cpe:2.3:o:microsoft:windows_server_2019:::::::x64:*`
microsoft	windows_server_2022	< 10.0.20348.5761 `cpe:2.3:o:microsoft:windows_server_2022:::::::x64:*`
microsoft	windows_server_2025	< 10.0.26100.33650 `cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*`

Original advisory text

Windows libarchive Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows Libarchive allows an unauthorized attacker to execute code over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69639 vendor-advisory patch

Fix within

Internet-facing 3 days

Internal 60 days

Not known to be exploited
Can be exploited automatically
Gives an attacker full control

Severity

9.8 Critical

Exploitation

<1% chance of attack within 30 days

Type

CWE-122Heap-based Buffer Overflow

Timeline

Published13 Oct 2026

Updated29 Oct 2026

First seen13 Oct 2026

Sources

CVE-2026-69639 · NVD

CVE-2026-69639 · MITRE

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