EUVD-2026-35688
GHSA-rj9f-334f-9rm5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows DHCP Server allows an authorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in the Windows DHCP Server service enables a locally authenticated, low-privileged attacker to disclose contents of process memory on affected systems. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms this is a local, low-complexity attack requiring only standard user privileges - no elevated rights or user interaction needed. Exploitation is constrained to hosts where the Windows DHCP Server role is actively installed and running, which significantly limits the attack surface to designated infrastructure servers rather than general workstations. No public exploit code has been identified at time of analysis, and this CVE does not appear in the CISA KEV catalog.
Technical ContextAI
CWE-125 (Out-of-bounds Read) describes a condition where software reads data past the end of an intended buffer, potentially exposing adjacent memory contents. In the context of the Windows DHCP Server service (a Windows Server role providing dynamic IP address assignment), a flaw in request or state processing allows a local attacker to trigger this read, leaking memory that may contain credentials, session tokens, or other sensitive server-side data. The affected products span a wide range of Windows builds per EUVD-2026-35688, covering both client editions (Windows 10 21H2/22H2/1607/1809, Windows 11 23H2/24H2/25H2/26H1) and server platforms (Windows Server 2012 through 2025, including Server Core variants). The tags note 'Buffer Overflow' alongside 'Information Disclosure,' which is a minor inconsistency - the CWE and description confirm a read-type OOB, not a write overflow; the 'Buffer Overflow' tag likely reflects a broader categorical grouping by the reporting system rather than a separate exploitable write primitive.
RemediationAI
Vendor-released patches are confirmed available via Microsoft Security Response Center. Apply the cumulative update that brings each affected OS build to or above its respective fixed version: Windows Server 2012/Server Core to 6.2.9200.26132, Windows Server 2012 R2/Server Core to 6.3.9600.23228, Windows Server 2016/Server Core to 10.0.14393.9234, Windows Server 2019/Server Core to 10.0.17763.8880, Windows Server 2022 to 10.0.20348.5256, Windows Server 2025/Server Core to 10.0.26100.32995 or 10.0.26100.8655 (per edition), Windows 11 23H2 to 10.0.22631.7219, Windows 11 24H2/25H2 to 10.0.26100.8655/10.0.26200.8655, and Windows 11 26H1 to 10.0.28000.2269. The full advisory with patch download links is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45634. As a compensating control where immediate patching is not possible, consider removing the DHCP Server role from hosts that do not strictly require it, or restricting local interactive and remote desktop access to the affected servers to minimize the pool of low-privileged users who could trigger the vulnerability. Note that restricting local logon access may impact legitimate administrative workflows and should be coordinated with operations teams before implementation.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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