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CVE-2026-40378

7.5 high Published
NVD · CVE.org

Memory allocation with excessive size value in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

Fix

Patch, vendor advisory and mitigation references on NVD 1

STIG rules that mitigate this class

Credential Guard isolates NTLM hashes and Kerberos tickets from the LSASS process the class of flaw reads. Microsoft Learn, "Credential Guard overview" (the owner's mapping, data/mitigations.yaml: credential-guard)

  • WN11-CC-000075 CAT I Credential Guard must be running on Windows 11 systems. Microsoft Windows 11

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · microsoftNVD modified 2026-10-28 20:02

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1