VulnerabilityAnalyzed
CVE-2026-47291
Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
CRITICAL 9.8EPSS 25.3%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 25.3%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 25.30% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-190
- Affected
- microsoft/windows 10 1607 · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows 11 25h2 · microsoft/windows 11 26h1 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2025
- Source
- secure@microsoft.com
EPSS moved from 1.0% on 24 September 2026 to 25.3% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.