CVE-2026-97830

Analyzed Analyzed - Analysis Complete

Double Free in Windows Internet Information Services

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-97830

EUVD

EUVD-2026-100431

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-415	The product calls free() twice on the same memory address.

Attack-Flow Graph

Executive Summary

This vulnerability is a double free issue in Windows Internet Information Services (IIS). A double free occurs when a program frees the same memory block twice, which can lead to crashes or other unexpected behavior. In this case, an unauthorized attacker could exploit this flaw to cause a denial of service over a network.

Impact Analysis

The primary impact is a denial of service, meaning affected systems may become unresponsive or crash. This could disrupt services hosted on IIS, leading to downtime for websites or applications relying on it.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the double free vulnerability in Internet Information Services. Monitor Microsoft's update guide for the specific patch release.

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