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CVE-2026-46243: smb: client: reject userspace cifs.spnego descriptions

highCVSS 7.8CVE-2026-46243

CSIRTS triage

product: smbOther
What
Userspace cifs.spnego descriptions are not being rejected properly.
Who is affected
Deployments using smb are affected.
Urgency
Remediation is urgent due to the high severity of the vulnerability (CVSS 7.8).
Action
Update smb to the latest version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46243

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-2026-46243coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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