EUVD-2026-44098
GHSA-5fc8-2988-xmjx
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable DNS service exploitable without auth or interaction (AV:N/PR:N/UI:N), but use-after-free race and heap grooming raise complexity to AC:H; high C/I/A from privileged code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Microsoft Windows DNS allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Network-based privilege elevation in Microsoft Windows DNS (Windows 11 24H2/25H2/26H1 and Windows Server 2025) stems from a use-after-free memory corruption condition that an unauthenticated remote attacker can exploit to gain elevated privileges with full confidentiality, integrity, and availability impact. The flaw requires no prior authentication or user interaction (PR:N/UI:N) but carries high attack complexity (AC:H), meaning reliable exploitation depends on winning a race or satisfying a specific memory-state timing window. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation targets the Windows DNS message-processing path and requires network access to a host running the affected DNS functionality on Windows 11 24H2/25H2/26H1 or Windows Server 2025 (including Server Core). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine priority given the combination of network attack vector (AV:N), no privilege requirement (PR:N), no user interaction (UI:N), and high impact across C/I/A yielding a CVSS base of 8.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker with network reach to an affected Windows DNS service sends a carefully sequenced set of crafted DNS messages designed to free an internal object and then trigger a dangling reference while grooming the heap so the freed memory is reoccupied with attacker-controlled data. By winning the timing window (reflecting the AC:H race condition), the attacker steers the reuse toward privileged code execution or state manipulation on the target. … |
| Remediation | Apply Microsoft's security update for CVE-2026-50487 as the primary fix - patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50487; deploy the applicable cumulative/KB update for each affected release (Windows 11 24H2, 25H2, 26H1 and Windows Server 2025 including Server Core) and confirm the exact patched build from the MSRC update guide, since specific fix version numbers are not included in the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems running versions 24H2, 25H2, or 26H1 and all Windows Server 2025 deployments in your environment. …
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External POC / Exploit Code
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