- Critical 9.8
CVE-2026-83578
Integer underflow (wrap or wraparound) in Windows PowerShell allows an unauthorized attacker to execute code over a network.
Scores
The facts
- Published
- 13 October 2026
- Last changed
- 16 October 2026
- NVD status
- Awaiting Analysis
- Severity
- Critical, CVSS 9.8 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- Known exploited
- Not in the CISA Known Exploited Vulnerabilities catalogue in this build.
- EPSS
- 1.0% chance of exploitation activity in the next 30 days (percentile 61).
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