CVE-2026-33115

As of 2026-04-14, CVE-2026-33115 is a CVSS 8.1 (HIGH-severity) vulnerability. EPSS exploitation probability 0.1%. Threadlinqs Intelligence tracks 2 threats exploiting it.

Last updated: 2026-04-14

A remote code execution vulnerability exists in .NET and Visual Studio due to unsafe deserialization in the BinaryFormatter fallback path. An attacker who successfully exploits this vulnerability could execute arbitrary code on the target system. The vulnerability was disclosed as part of the Microsoft April 2026 Patch Tuesday release, which remediated 167 vulnerabilities across Windows, Office, SharePoint, .NET, Defender, Active Directory, Remote Desktop, Azure, Hyper-V, and supporting components. This CVE was rated Critical severity with a CVSS 8.1 base score. Exploitation requires an attacker to craft a malicious serialized object that triggers the BinaryFormatter deserialization path, which can lead to full code execution in the context of the application.

CVSS v3 vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-502

Threats tracking this CVE

• Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE) — CRITICAL
• Microsoft April 2026 Patch Tuesday — 167 Flaws, 2 Zero-Days (SharePoint Spoofing CVE-2026-32201 + Defender EoP CVE-2026-33825) — CRITICAL

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33115
• https://nvd.nist.gov/vuln/detail/CVE-2026-33115

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.