Unauthenticated denial of service via HTTP/2 traffic
Published Jun 9, 2026 · Updated Jun 9, 2026
Uncontrolled resource consumption in HTTP/2 on affected Windows releases allows remote attackers to interrupt service over a network. Microsoft identifies HTTP.sys but has not disclosed which request property, code path, or resource operation lacks an effective limit. Network access to an HTTP.sys-backed service is sufficient; the record establishes availability loss but does not specify a host crash.
Summary
What happened
Uncontrolled resource consumption in HTTP/2 on affected Windows releases allows remote attackers to interrupt service over a network. Microsoft identifies HTTP.sys but has not disclosed which request property, code path, or resource operation lacks an effective limit. Network access to an HTTP.sys-backed service is sufficient; the record establishes availability loss but does not specify a host crash.
The record
- CVE
- CVE-2026-49160
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-400, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.8880
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CVE-2026-49160 and CVE-2026-47291 HTTP.sys PoCfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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