CVE-2026-32203
published 2026-04-14CVE-2026-32203: Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.
PriorityP350high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
1.55%
72.4th percentile
Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_visual_studio_2022_version_17.12 | >= 17.12.0 < 17.12.19 | 17.12.19 |
| microsoft | microsoft_visual_studio_2022_version_17.14 | >= 17.14.0 < 17.14.30 | 17.14.30 |
| microsoft | microsoft_visual_studio_2026_version_18.4 | >= 18.4.0 < 18.4.4 | 18.4.4 |
| microsoft | net | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | net | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | net | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | net_10.0 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | net_8.0 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | net_9.0 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | visual_studio_2022 | >= 17.12.0 < 17.12.19 | 17.12.19 |
| microsoft | visual_studio_2022 | >= 17.14.0 < 17.14.30 | 17.14.30 |
| microsoft | visual_studio_2026 | >= 18.4.0 < 18.4.4 | 18.4.4 |
| ubuntu | dotnet10 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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Ubuntu
.NET vulnerabilities
vendor_ubuntu·2026-04-28·CVSS 7.5
CVE-2026-33116 [HIGH] .NET vulnerabilities
Title: .NET vulnerabilities
Summary: Several security issues were fixed in .NET.
Ludvig Pedersen discovered that the System.Security.Cryptography.Xml
library in .NET incorrectly handled certain XML inputs. An attacker could
possibly use this issue to consume excessive resources, resulting in a
denial of service. (CVE-2026-33116, CVE-2026-26171)
Ludvig Pedersen and Kevin Jones discovered that the
System.Security.Cryptography.Xml library in .NET incorrectly handled
certain XML inputs. An attacker could possibly use this issue to cause
.NET to crash, resulting in a denial of service. (CVE-2026-32203)
Ludvig Pedersen discovered that the System.Net.Mail component in .NET
incorrectly handled certain inputs. An attacker could possibly use this
issue to perform a network spoofing attack. (CVE-
Ubuntu
.NET vulnerabilities
vendor_ubuntu·2026-04-15·CVSS 7.5
CVE-2026-26171 [HIGH] .NET vulnerabilities
Title: .NET vulnerabilities
Summary: Several security issues were fixed in .NET.
Ludvig Pedersen discovered that the System.Security.Cryptography.Xml
library in .NET incorrectly handled certain XML inputs. An attacker could
possibly use this issue to consume excessive resources, resulting in a
denial of service. (CVE-2026-33116, CVE-2026-26171)
Ludvig Pedersen and Kevin Jones discovered that the
System.Security.Cryptography.Xml library in .NET incorrectly handled
certain XML inputs. An attacker could possibly use this issue to cause
.NET to crash, resulting in a denial of service. (CVE-2026-32203)
Ludvig Pedersen discovered that the System.Net.Mail component in .NET
incorrectly handled certain inputs. An attacker could possibly use this
issue to perform a network spoofing attack. (CVE-
Red Hat
dotnet: .NET: Denial of Service via stack overflow
vendor_redhat·2026-04-14·CVSS 7.5
CVE-2026-32203 [HIGH] CWE-787 dotnet: .NET: Denial of Service via stack overflow
dotnet: .NET: Denial of Service via stack overflow
A flaw was found in .NET. A remote attacker could exploit a stack overflow vulnerability during encrypted key nested decryption, leading to a Denial of Service (DoS). This could make the affected system unavailable to legitimate users.
Statement: This is an Important denial of service vulnerability in .NET, affecting Red Hat Enterprise Linux and Fedora. The flaw, a stack overflow in EncryptedKey nested decryption, could allow an attacker to cause a denial of service.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Package: dotnet10.0 (Red H
VulDB
Microsoft .NET/Visual Studio prior 8.0.26/9.0.15/10.0.6/17.12.19/17.14.30 stack-based overflow
vuldb·2026-04-14·CVSS 7.5
CVE-2026-32203 [HIGH] Microsoft .NET/Visual Studio prior 8.0.26/9.0.15/10.0.6/17.12.19/17.14.30 stack-based overflow
A vulnerability marked as problematic has been reported in Microsoft .NET and Visual Studio. This issue affects some unknown processing. The manipulation leads to stack-based buffer overflow.
This vulnerability is referenced as CVE-2026-32203. Remote exploitation of the attack is possible. No exploit is available.
It is suggested to upgrade the affected component.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-32203 dotnet9.0: .NET: Denial of Service via stack overflow [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32203 [HIGH] CVE-2026-32203 dotnet9.0: .NET: Denial of Service via stack overflow [fedora-all]
CVE-2026-32203 dotnet9.0: .NET: Denial of Service via stack overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-32203 dotnet10.0: .NET: Denial of Service via stack overflow [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32203 [HIGH] CVE-2026-32203 dotnet10.0: .NET: Denial of Service via stack overflow [fedora-all]
CVE-2026-32203 dotnet10.0: .NET: Denial of Service via stack overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-32203 dotnet8.0: .NET: Denial of Service via stack overflow [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32203 [HIGH] CVE-2026-32203 dotnet8.0: .NET: Denial of Service via stack overflow [fedora-all]
CVE-2026-32203 dotnet8.0: .NET: Denial of Service via stack overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-32203 dotnet: .NET: Denial of Service via stack overflow
bugzilla·2026-04-13·CVSS 7.5
CVE-2026-32203 [HIGH] CVE-2026-32203 dotnet: .NET: Denial of Service via stack overflow
CVE-2026-32203 dotnet: .NET: Denial of Service via stack overflow
.NET - Denial Of Service - Denial of Service via Stack Overflow in EncryptedKey Nested Decryption
Bleepingcomputer
Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
blogs_bleepingcomputer·2026-04-14·CVSS 6.5
[MEDIUM] Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
## Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
## Lawrence Abrams
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
This Patch Tuesday also addresses eight "Critical" vulnerabilities, 7 of which are remote code execution flaws and the other is a denial of service flaw.
The number of bugs in each vulnerability category is listed below:
93 Elevation of Privilege Vulnerabilities
13 Security Feature Bypass Vulnerabilities
20 Remote Code Execution Vulnerabilities
21 Information Disclosure Vulnerabilities
10 Denial of Service Vulnerabilities
9 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today.
Therefore, the
Sans Isc
Microsoft Patch Tuesday April 2026., (Tue, Apr 14th)
blogs_sans_isc·2026-04-14·CVSS 8.8
[HIGH] Microsoft Patch Tuesday April 2026., (Tue, Apr 14th)
Microsoft Patch Tuesday April 2026.
Published: 2026-04-14. Last Updated: 2026-04-14 17:46:09 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
This month's Microsoft Patch Tuesday looks like a record one, but let's look at it a bit closer to understand what is happening
The update patches a total of 243 vulnerabilities. However, 78 of them are Chromium issues affecting Microsoft Edge. Patches for Edge were released earlier. This leaves 165 vulnerabilities that are not Edge-related. Of these, 8 are rated critical, and 154 are important. One vulnerability has already been exploited, and another was made public before today but has not yet been seen in the wild.
Noteworthy Vulnerabilities:
CVE-2026-33827 (Windows TCP/IP Remote Code Execution Vulnerability): As a packet nerd, I love thes
Rapid7
Patch Tuesday - April 2026
blogs_rapid7·2026-04-14·CVSS 6.5
[MEDIUM] Patch Tuesday - April 2026
Microsoft is publishing 167 vulnerabilities on April 2026 Patch Tuesday . Microsoft is aware of exploitation in the wild for one of today’s vulnerabilities, and public disclosure for one other. Microsoft evaluates 19 of the vulnerabilities published today as more likely to see future exploitation. So far this month, Microsoft has provided patches to address 80 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Increasing volumes of vulnerabilities
Regular Patch Tuesday watchers will know that these vulnerability totals are significantly higher than usual, especially the browser numbers. Late last week, Microsoft published patches to resolve more than 60 browser vulnerabilities in a single day, which is a new record in that very specific category.
It mig
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32203https://access.redhat.com/errata/RHSA-2026:13280https://access.redhat.com/errata/RHSA-2026:13281https://access.redhat.com/errata/RHSA-2026:13282https://access.redhat.com/errata/RHSA-2026:13283https://access.redhat.com/errata/RHSA-2026:13693https://access.redhat.com/errata/RHSA-2026:8467https://access.redhat.com/errata/RHSA-2026:8468https://access.redhat.com/errata/RHSA-2026:8469https://access.redhat.com/errata/RHSA-2026:8470https://access.redhat.com/errata/RHSA-2026:8471https://access.redhat.com/errata/RHSA-2026:8472https://access.redhat.com/errata/RHSA-2026:8473https://access.redhat.com/errata/RHSA-2026:8474https://access.redhat.com/errata/RHSA-2026:8475https://access.redhat.com/errata/RHSA-2026:9077https://access.redhat.com/errata/RHSA-2026:9080https://access.redhat.com/errata/RHSA-2026:9205https://access.redhat.com/security/cve/CVE-2026-32203https://bugzilla.redhat.com/show_bug.cgi?id=2457740https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32203.json
2026-04-14
Published