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Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2026-03-17 | Published 2026-04-14 | Updated 2026-06-01 | Assigner microsoft




HIGH: 7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-416: Use After Free

Product status

10.0.14393.0 (custom) before 10.0.14393.9060
affected

10.0.17763.0 (custom) before 10.0.17763.8644
affected

10.0.19044.0 (custom) before 10.0.19044.7184
affected

10.0.19045.0 (custom) before 10.0.19045.7184
affected

10.0.22631.0 (custom) before 10.0.22631.6936
affected

10.0.22631.0 (custom) before 10.0.22631.6936
affected

10.0.26100.0 (custom) before 10.0.26100.8246
affected

10.0.26200.0 (custom) before 10.0.26200.8246
affected

10.0.28000.0 (custom) before 10.0.28000.1836
affected

6.2.9200.0 (custom) before 6.2.9200.26026
affected

6.2.9200.0 (custom) before 6.2.9200.26026
affected

6.3.9600.0 (custom) before 6.3.9600.23132
affected

6.3.9600.0 (custom) before 6.3.9600.23132
affected

10.0.14393.0 (custom) before 10.0.14393.9060
affected

10.0.14393.0 (custom) before 10.0.14393.9060
affected

10.0.17763.0 (custom) before 10.0.17763.8644
affected

10.0.17763.0 (custom) before 10.0.17763.8644
affected

10.0.20348.0 (custom) before 10.0.20348.5020
affected

10.0.25398.0 (custom) before 10.0.25398.2274
affected

10.0.26100.0 (custom) before 10.0.26100.32690
affected

10.0.26100.0 (custom) before 10.0.26100.32690
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33100 (Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-33100)

nvd.nist.gov (CVE-2026-33100)

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