EUVD-2026-43953
GHSA-8jjv-cw3q-wm8p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local-only access with low-privilege user required; pure confidentiality impact via memory read; no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Buffer over-read in Windows Print Spooler Components allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Print Spooler Components on multiple Windows 10, 11, and Server editions contain a buffer over-read flaw (CWE-126) that allows a locally authenticated attacker with low privileges to disclose sensitive memory contents. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms exploitation requires local access and a standard user account, limiting the attack surface to insiders or already-compromised endpoints. No public exploit or active exploitation has been identified at time of analysis, and EPSS at 0.30% (22nd percentile) alongside SSVC exploitation status of 'none' together indicate low near-term exploitation probability.
Technical ContextAI
The Windows Print Spooler service (spoolsv.exe) manages print jobs and printer communications on Windows systems. CWE-126 (Buffer Over-Read) describes a condition where a component reads beyond the allocated boundary of a buffer, potentially exposing adjacent memory regions that may contain sensitive data such as credentials, keys, or process memory. The flaw resides specifically within the Print Spooler Components subsystem rather than in a network-facing protocol handler, constraining its reach to local execution contexts. Affected CPEs span cpe:2.3:a:microsoft:windows_10_version_1809 through cpe:2.3:a:microsoft:windows_server_2025, indicating a wide but client/server-local attack surface across the NT 10.0 build family.
RemediationAI
Apply the vendor-released patch via Windows Update or WSUS targeting the specific build thresholds confirmed by EUVD data: update Windows 10 1809/Server 2019 to build 10.0.17763.9020 or later, Windows 10 21H2 to 10.0.19044.7548 or later, Windows 10 22H2 to 10.0.19045.7548 or later, Windows 11 24H2 to 10.0.26100.8875 or later, Windows 11 25H2 to 10.0.26200.8875 or later, Windows 11 26H1 to 10.0.28000.2269 or later, Windows Server 2022 to 10.0.20348.5386 or later, and Windows Server 2025 to 10.0.26100.33158 or later. The authoritative advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50383. As a compensating control where patching is delayed, restrict local logon rights on Print Spooler hosts to only necessary accounts using Group Policy (User Rights Assignment), and audit membership of local groups on print servers - this limits who can reach the vulnerable code path locally. Note that disabling the Print Spooler service entirely (as was sometimes recommended for PrintNightmare mitigations) prevents printing functionality on those systems and may be acceptable on non-print servers. No workaround fully eliminates the flaw; patching is the definitive fix.
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Same weakness CWE-126 – Buffer Over-read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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