EUVD-2026-43803
GHSA-wrm6-j53r-328q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable, low-complexity, unauthenticated HTTP/2 DoS with no user interaction; impact is availability-only, so C:N/I:N/A:H and unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Allocation of resources without limits or throttling in HTTP/2 allows an unauthorized attacker to deny service over a network.
AnalysisAI
Denial of service in the Windows HTTP/2 network stack allows a remote, unauthenticated attacker to exhaust server resources and render affected services unavailable across a broad range of Windows client and server releases (Windows 10/11 and Windows Server 2016 through 2025). Reported by Microsoft with a vendor patch available; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable target must have the Windows HTTP/2 protocol handler enabled and reachable - i.e., an HTTP/2-capable endpoint such as IIS or an HTTP.sys-based service accepting HTTP/2 (typically over TLS) on a network-reachable interface. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base 7.5) indicates a network-reachable, low-complexity, unauthenticated attack with no user interaction and impact limited entirely to availability - consistent with a resource-exhaustion DoS rather than a compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker opens HTTP/2 connections to an internet-facing Windows service (for example an IIS site or HTTP.sys-hosted application) and issues a stream of crafted HTTP/2 frames or streams that each trigger unbounded server-side allocation. Because the attack requires no authentication, no user interaction, and low complexity, a single modest client can drive the server into memory/CPU exhaustion and take the service offline. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49788 (Patch available per vendor advisory); consult the per-edition fixed builds in the Microsoft Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49788 and deploy the cumulative update matching each affected Windows 10/11 or Windows Server edition. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2016-2025 systems running HTTP/2-dependent services to identify critical dependencies. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today