CVE tracker / CVE-2026-116697

CVE-2026-116697

CVE-2026-116697 is the Reliable Multicast Transport Driver (RMCAST) Denial of Service Vulnerability. Microsoft rates it Important, CVSS 5.9. It is not in CISA's Known Exploited Vulnerabilities catalog. Published November 10, 2026.

Risk summary

MediumDenial of Service

5.9

CVSS v3 base

Medium

Severity

Important

Microsoft's rating

Less Likely

Microsoft: exploitation

In CISA KEV

Microsoft describes it: “Null pointer dereference in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to deny service over a network.”

How to fix it

Microsoft lists 28 affected products and the update that fixes each:

KB5131077 · fixed build 10.0.26100.33730
Windows Server 2025 (Server Core installation), Windows Server 2025
KB5131080 · fixed build 10.0.26100.33822
Windows Server 2025 (Server Core installation), Windows Server 2025
KB5131085 · fixed build 10.0.17763.9487
Windows Server 2019 (Server Core installation), Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows Server 2019
KB5131087 · fixed build 10.0.22631.7711
Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems
KB5131090 · fixed build 10.0.20348.5870
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5131096 · fixed builds 10.0.19045.7846, 10.0.19044.7846
Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 22H2 for 32-bit Systems, and 1 more
KB5131291 · fixed build 10.0.14393.9688
Windows Server 2016 (Server Core installation), Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016
KB5132043 · fixed builds 10.0.26300.9911, 10.0.26200.9911, 10.0.26100.9911
Windows 11 Version 26H2 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 24H2 for x64-based Systems, and 1 more
KB5132059 · fixed build 10.0.28000.3501
Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems
KB5132061 · fixed builds 10.0.26300.9974, 10.0.26200.9974, 10.0.26100.9974
Windows 11 Version 26H2 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 24H2 for x64-based Systems, and 1 more

What Microsoft changed

November 10, 2026: Information published.

Details

Weakness: CWE-476: NULL Pointer Dereference
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: November 10, 2026
Last revised: November 10, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.