CVE-2026-47291CWE-122CWE-190

HTTP.sys Remote Code Execution Vulnerability

Critical · published June 9, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
65.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.01090 · 65.1th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-190 · Integer Overflow or Wraparound
Published
2026-06-09T17:04Z
EPSS history
Timeline
  • 25 SEP 03:26Z
    EPSS moved 23% → 1%
    epss
  • 09 JUN 17:04Z
    HTTP.sys Remote Code Execution Vulnerability
    cvelistv5