CVE-2026-32203Network attack vector

Service interruption via EncryptedXml stack overflow

Published Apr 14, 2026 · Updated Apr 14, 2026

Stack-based buffer overflow in EncryptedXml in Microsoft .NET and Visual Studio allows remote attackers to interrupt services over a network. Microsoft identifies the locus as the System.Security.Cryptography.Xml EncryptedXml class but has not disclosed which input or write operation overruns the stack buffer. Unauthenticated network access is sufficient; successful exploitation interrupts the process without reported confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability1.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in EncryptedXml in Microsoft .NET and Visual Studio allows remote attackers to interrupt services over a network. Microsoft identifies the locus as the System.Security.Cryptography.Xml EncryptedXml class but has not disclosed which input or write operation overruns the stack buffer. Unauthenticated network access is sufficient; successful exploitation interrupts the process without reported confidentiality or integrity impact.

The record

CVE
CVE-2026-32203
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Microsoft
Product
.NET 9.0
Classifications
CWE-121, CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 9.0version=9.0.0 <9.0.15
Microsoft · .NET 10.0version=10.0.0 <10.0.6
Microsoft · Microsoft Visual Studio 2022 version 17.12version=17.12.0 <17.12.19
Microsoft · Microsoft Visual Studio 2022 version 17.14version=17.14.0 <17.14.30
Microsoft · .NET 8version=8.0.0 <8.0.26

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5redhat-SADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo