CVE-2026-47291: exploitation status and patch state

CVE-2026-47291 · CVSS 9.8 CRITICAL · EPSS 23% · patch available

Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.

Is CVE-2026-47291 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at 23%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• KB5094123
• KB5094128
• KB5094127
• KB5094125
• KB5094126
• KB5093998
• KB5095051
• KB5094122
• KB5094042
• KB5094041

What PlainSec published about CVE-2026-47291

• ShareFile Shutdown Signals More Than Maintenance (2026-07-13)

Primary sources

• NVD record
• Microsoft KB5094123
• Microsoft KB5094128
• Microsoft KB5094127
• Microsoft KB5094125
• Microsoft KB5094126
• Microsoft KB5093998
• Microsoft KB5095051
• Microsoft KB5094122
• Microsoft KB5094042

What this record does not say

• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-12.