HTTP.sys HTTP/2 Bomb Denial of Service
CVE-2026-49160 is a denial-of-service vulnerability in the Windows HTTP Protocol Stack (HTTP.sys) caused by uncontrolled resource consumption in HTTP/2. Public reporting describes the issue as tied to the "HTTP/2 Bomb" technique, which abuses HTTP/2 header compression and large numbers of tiny messages/headers to force rapid memory allocation by the server until the service becomes unstable or crashes. Microsoft characterizes the flaw as an unauthorized network-reachable DoS in HTTP.sys with no required privileges or user interaction.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An uncontrolled resource consumption vulnerability in HTTP.sys that allows unauthenticated remote denial of service over public networks.
A denial-of-service vulnerability in HTTP.sys associated with the HTTP/2 Bomb technique.
A denial of service vulnerability in Windows HTTP Protocol Stack (http.sys).
A publicly known Microsoft vulnerability disclosed in this Patch Tuesday release; Microsoft said it was not yet exploited in the wild at time of release.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.