EUVD-2026-73409
GHSA-79mj-7fc8-chq5
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Network-reachable service requires low-privilege auth and user interaction; only confidentiality impacted via memory read, no write or crash possible.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Windows Program Compatibility Assistant Service allows an authorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read in the Windows Program Compatibility Assistant (PCA) Service exposes high-confidence memory contents to authenticated network attackers across a broad swath of Windows 10, 11, and Windows Server releases. The flaw (CWE-125) allows a low-privileged user who triggers the right interaction to cause the service to read beyond a buffer boundary, leaking memory over the network with no integrity or availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privilege account on the target Windows system (PR:L) - unauthenticated remote exploitation is not possible per the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.7 (Medium) rating is consistent with the vector: network-reachable, low complexity, but gated behind authenticated access (PR:L) and user interaction (UI:R), limiting opportunistic mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's cumulative security updates that bring affected builds to or above the fixed build numbers listed per platform: Windows 10 1607 and Server 2016 to 10.0.14393.9512 or later; Windows 10 1809 and Server 2019 to 10.0.17763.9245 or later; Windows 10 21H2 to 10.0.19044.7725 or later; Windows 10 22H2 to 10.0.19045.7725 or later; Windows 11 23H2 to 10.0.22631.7582 or later; Windows 11 24H2 and Server 2025 to 10.0.26100.9445 / 10.0.26100.33438 or later; Windows 11 25H2 to 10.0.26200.9445 or later; Windows 11 26H1 to 10.0.28000.2954 or later; Server 2012 to 6.2.9200.26349 or later; Server 2012 R2 to 6.3.9600.23397 or later; Server 2022 to 10.0.20348.5622 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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