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Windows IIS Web Server Double-Free Reachable by Unauthenticated Network Attackers

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-97830

Key Details

CVECVE-2026-97830
CVSS Score / Version
7.5 (High) / CVSS v3.1
Updated2026-10-14
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products
see table below
Classified as
CWE-415 (Double Free)
Exploitation prediction (EPSS)
0.87% probability of exploitation in the next 30 days (58% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows 11 (version 23H2)
MicrosoftWindows 11 (version 24H2)
MicrosoftWindows 11 (version 25H2)
MicrosoftWindows 11 (version 26H1)
MicrosoftWindows Server 2025
MicrosoftWindows Server 2022
MicrosoftWindows 11 Version 26H2
Microsoftwindows_11_26h2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Double free in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.

What to Do

Monitor Microsoft's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-97830
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-97830
Vendor advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97830

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