CVE-2026-34344

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

En bref

Sévérité: HIGH 7.8
EPSS: EPSS 0.31 % · centile 24 (2026-10-27)
État: PUBLISHED
Publiée: 2026-05-12
Mise à jour: 2026-08-10
Attribuée par: microsoft
Statut NVD: Analyzed

Description

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · secure@microsoft.com (Secondary)

Faiblesses (CWE)

CWE-843

Références européennes

ENISA EUVD · EUVD-2026-29603
GCVE · GCVE-0-2026-34344

Avis du CERT-FR

CERTFR-2026-AVI-0585 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* < 10.0.14393.9140
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* < 10.0.14393.9140
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* < 10.0.17763.8755
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* < 10.0.17763.8755
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* < 10.0.19044.7291
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* < 10.0.19044.7291
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* < 10.0.19044.7291
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* < 10.0.19045.7291
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:* < 10.0.19045.7291
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:* < 10.0.19045.7291
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* < 10.0.22631.7079
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* < 10.0.22631.7079
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* < 10.0.26100.8390
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:* < 10.0.26100.8390
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* < 10.0.26200.8390
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:* < 10.0.26200.8390
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:* < 10.0.28000.2113
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:* < 10.0.28000.2113
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* < 10.0.14393.9140
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* < 10.0.17763.8755
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* < 10.0.20348.5074
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* < 10.0.25398.2330
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* < 10.0.26100.32772

Produits affectés

Produit	Versions
Microsoft · Windows 10 Version 1607	affected 10.0.14393.0 < 10.0.14393.9140
Microsoft · Windows 10 Version 1809	affected 10.0.17763.0 < 10.0.17763.8755
Microsoft · Windows 10 Version 21H2	affected 10.0.19044.0 < 10.0.19044.7291
Microsoft · Windows 10 Version 22H2	affected 10.0.19045.0 < 10.0.19045.7417
Microsoft · Windows 11 version 23H2	affected 10.0.22631.0 < 10.0.22631.7079
Microsoft · Windows 11 Version 23H2	affected 10.0.22631.0 < 10.0.22631.7219
Microsoft · Windows 11 Version 24H2	affected 10.0.26100.0 < 10.0.26100.8457
Microsoft · Windows 11 Version 25H2	affected 10.0.26200.0 < 10.0.26200.8457
Microsoft · Windows 11 version 26H1	affected 10.0.28000.0 < 10.0.28000.2113
Microsoft · Windows Server 2012	affected 6.2.9200.0 < 6.2.9200.26079
Microsoft · Windows Server 2012 (Server Core installation)	affected 6.2.9200.0 < 6.2.9200.26079
Microsoft · Windows Server 2012 R2	affected 6.3.9600.0 < 6.3.9600.23181
Microsoft · Windows Server 2012 R2 (Server Core installation)	affected 6.3.9600.0 < 6.3.9600.23181
Microsoft · Windows Server 2016	affected 10.0.14393.0 < 10.0.14393.9140
Microsoft · Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 < 10.0.14393.9140
Microsoft · Windows Server 2019	affected 10.0.17763.0 < 10.0.17763.8755
Microsoft · Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 < 10.0.17763.8755
Microsoft · Windows Server 2022	affected 10.0.20348.0 < 10.0.20348.5139
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)	affected 10.0.25398.0 < 10.0.25398.2330
Microsoft · Windows Server 2025	affected 10.0.26100.0 < 10.0.26100.32860

Références

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34344

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD