CVE-2026-49787: HTTP.sys Denial of Service Vulnerability
Allocation of resources without limits or throttling in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.
CSIRTS triage
- What
- Allocation of resources without limits allows an unauthorized attacker to deny service over a network.
- Who is affected
- Deployments of Windows using HTTP.sys.
- Urgency
- Remediation is urgent due to the high severity and potential for denial of service.
- Action
- Implement the recommended mitigations or apply the latest patch.
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-2026-49787
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.
- Moderate exploitation riskCVE-2026-497871.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 65% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-49787 | coverage & exploitation status | NVD · CVE.org |
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