CVE-2026-49160: HTTP.sys Denial of Service Vulnerability
Uncontrolled resource consumption in HTTP/2 allows an unauthorized attacker to deny service over a network.
CSIRTS triage
- What
- This vulnerability allows an unauthorized attacker to deny service over a network.
- Who is affected
- Users of HTTP.sys are affected.
- Urgency
- Remediation is urgent due to the high severity of the vulnerability.
- Action
- Apply the latest security updates from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49160
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Elevated exploitation riskCVE-2026-4916048.4% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-49160 | coverage & exploitation status | NVD · CVE.org |
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