ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-97830

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

Published Oct 13, 2026 · catalog updated Oct 15, 2026 · Microsoft Windows 11 version 23H2

Check if you run it

No confirmed exploitation is on record for CVE-2026-97830. EPSS is 0.87%. Act only if a listed version of Microsoft Windows 11 version 23H2 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.87%
Remediation
Advisory link
Affected products
cpe microsoft/windows 11 23h2 · cpe microsoft/windows 11 24h2 · cpe microsoft/windows 11 25h2 · cpe microsoft/windows 11 26h1 · vendor Microsoft Windows 11 Version 23H2 · vendor Microsoft Windows 11 Version 24H2

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 11 23h2version unspecified
  • cpe microsoft/windows 11 24h2version unspecified
  • cpe microsoft/windows 11 25h2version unspecified
  • cpe microsoft/windows 11 26h1version unspecified
  • vendor Microsoft Windows 11 Version 23H2version unspecified
  • vendor Microsoft Windows 11 Version 24H2version unspecified
  • vendor Microsoft Windows 11 Version 25H2version unspecified
  • vendor Microsoft Windows 11 Version 26H2version unspecified
  • vendor Microsoft Windows 11 version 23H2version unspecified
  • vendor Microsoft Windows 11 version 26H1version unspecified
  • vendor Microsoft Windows Server 2022version unspecified
  • vendor Microsoft Windows Server 2025version unspecified

How to fix CVE-2026-97830

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-97830. EPSS is 0.87%. Act only if a listed version of Microsoft Windows 11 version 23H2 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-415: Double Free. EPSS 0.87%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

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

  2. Oct 14, 2026 · NIST NVD

    Updated

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

  3. Oct 15, 2026 · CIRCL Vulnerability Lookup

    Updated

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

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-97830

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

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-97830

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-97830

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-97830

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.