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Vulnerability record · CVE-2026-49160 · published 9 June 2026

CVE-2026-49160: Windows HTTP/2 resource consumption denial of service

Microsoft · Windows 10 1607

Windows HTTP/2 handling allows uncontrolled resource consumption (CWE-400), letting an unauthenticated remote attacker exhaust resources and deny service. The flaw affects a broad set of Windows 10, Windows 11 and Windows Server releases, so any internet- or network-exposed HTTP/2 endpoint on those platforms is a candidate target.

7.5 CVSS 3.1 High EPSS 1.2% · top 33.8% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
1References
23 Jul 2026Last modified by NVD

Description

Uncontrolled resource consumption in HTTP/2 allows an unauthorized attacker to deny service over a network.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 20 September 2026. Confidence: medium.

high priorityNetwork-reachable, unauthenticated availability impact across many widely deployed Windows versions, with high EPSS despite no KEV listing or known exploit.

What it is

Windows HTTP/2 handling allows uncontrolled resource consumption (CWE-400), letting an unauthenticated remote attacker exhaust resources and deny service. The flaw affects a broad set of Windows 10, Windows 11 and Windows Server releases, so any internet- or network-exposed HTTP/2 endpoint on those platforms is a candidate target.

Impact

An attacker can degrade or take down HTTP/2 service availability on the affected host; there is no confidentiality or integrity impact per the CVSS vector, only availability loss.

Attack surface

Reached over the network via HTTP/2 traffic (AV:N, PR:N, UI:N), so no authentication or user interaction is required. Any service on the affected Windows versions that accepts HTTP/2 connections is in scope.

Exploitation

Not listed in CISA KEV and no public exploit or exploitation tags appear in the references, but EPSS is high at roughly 0.54 (99th percentile), indicating elevated near-term exploitation likelihood.

What to do

  • Apply the Microsoft update for CVE-2026-49160 across all affected Windows 10, Windows 11 and Windows Server versions as the primary fix.
  • Where patching is delayed, restrict or rate-limit HTTP/2 traffic at the edge and disable HTTP/2 on services that do not require it.
  • Monitor connection and memory/CPU consumption on HTTP/2 listeners and cap concurrent streams or connections per client.
  • Prioritize internet-facing and shared Windows Server hosts for patching before internal workstations.

Detection

  • Alert on sustained spikes in concurrent HTTP/2 connections, streams or memory/CPU on Windows HTTP/2 listeners.
  • Baseline normal HTTP/2 request and connection rates per host and flag deviations consistent with resource exhaustion.
  • Correlate Windows event and IIS/HTTP.sys logs for repeated connection resets or service unavailability on affected hosts.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49160 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-49160), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.