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Description

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

PUBLISHED Reserved 2026-01-14 | Published 2026-04-14 | Updated 2026-06-01 | Assigner microsoft




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Problem types

CWE-755: Improper Handling of Exceptional Conditions

Product status

3.5.0 (custom) before 2.0.50727.8982 & 3.0.30729.8976
affected

4.7.0 (custom) before 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0
affected

4.8.0 (custom) before 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0
affected

4.8.1 (custom) before 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0
affected

4.7.0 (custom) before 4.8.4801.0
affected

4.8.0 (custom) before 4.8.4801.0
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666 (.NET Framework Denial of Service Vulnerability) vendor-advisory patch

cve.org (CVE-2026-23666)

nvd.nist.gov (CVE-2026-23666)

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