CVE-2026-83578CWE-122CWE-190CWE-191

CVE-2026-83578

Critical · published October 13, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
61.1
In the wild
Unconfirmed
What it is

Integer underflow (wrap or wraparound) in Windows PowerShell 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
CVSS v4.0
Not supplied
EPSS
0.00958 · 61.1th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-190 · Integer Overflow or Wraparound; CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-10-13T23:20Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83578 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 1%
    epss
  • 13 OCT 18:59Z
    Microsoft PowerShell Remote Code Execution Vulnerability
    cvelistv5
  • 13 OCT 18:59Z
    Microsoft PowerShell Remote Code Execution Vulnerability
    cvelistv5