CVE-2026-23666

Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.3% chance of exploitation in the next 30 days; higher than 70% of CVEs (scores of 2026-10-26)

CWEs

CWE-755, CWE-366

Published

2026-04-14

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• microsoft:.net_framework

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666
• https://access.redhat.com/security/cve/CVE-2026-23666
• https://bugzilla.redhat.com/show_bug.cgi?id=2458271
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json

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