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CVE-2026-34346: Windows Ancillary Function Driver for WinSock Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-34346
Cleartext transmission of sensitive information in Windows Ancillary Function Driver for WinSock allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Ancillary Function Driver for WinSockInformation disclosure
What
Cleartext transmission of sensitive information allows an authorized attacker to disclose information locally.
Who is affected
Authorized users of Windows Ancillary Function Driver for WinSock.
Urgency
Remediation is necessary due to the medium severity and risk of information disclosure.
Action
Apply the latest security patch for Windows Ancillary Function Driver.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34346

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-34346coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Ancillary Function

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center