CVE-2026-32178
published 2026-04-14CVE-2026-32178: Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.
PriorityP353high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
2.28%
81.3th percentile
Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.
Affected
48 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft.netcore.app.runtime.linux-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-arm | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-arm | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.linux-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.linux-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.linux-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.linux-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.osx-arm64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.osx-arm64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.osx-arm64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.osx-x64 | >= 10.0.0 < 10.0.6 | 10.0.6 |
| microsoft | microsoft.netcore.app.runtime.osx-x64 | >= 8.0.0 < 8.0.26 | 8.0.26 |
| microsoft | microsoft.netcore.app.runtime.osx-x64 | >= 9.0.0 < 9.0.15 | 9.0.15 |
| microsoft | microsoft.netcore.app.runtime.win-arm | >= 10.0.0 < 10.0.6 | 10.0.6 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
ghsa7.5HIGH
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: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
vendor_redhat·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
A flaw was found in dotnet. A remote attacker could exploit a parsing flaw in the System.Net.Mail component, specifically within the MailAddress functionality. This vulnerability allows for SMTP (Simple Mail Transfer Protocol) Command Injection and Header Injection. Successful exploitation could lead to the disclosure of sensitive information.
Package: dotnet10.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet8.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet9.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet10.0 (Red Hat Enterprise Linux 8) - Affected
Package: dotnet8.0 (Red Hat Enterprise Linux 8) - Affected
Package: dotnet9.0 (Red Hat Enterprise Linux 8) - Affected
VulDB
Microsoft .NET 2016/2017/2019/2022/2025 special element
vuldb·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] Microsoft .NET 2016/2017/2019/2022/2025 special element
A vulnerability identified as problematic has been detected in Microsoft .NET 2016/2017/2019/2022/2025. Affected is an unknown function. This manipulation causes improper neutralization of special elements.
The identification of this vulnerability is CVE-2026-32178. It is possible to initiate the attack remotely. There is no exploit available.
You should upgrade the affected component.
GHSA
Microsoft Security Advisory CVE-2026-32178 – .NET Spoofing Vulnerability
ghsa·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] CWE-138 Microsoft Security Advisory CVE-2026-32178 – .NET Spoofing Vulnerability
Microsoft Security Advisory CVE-2026-32178 – .NET Spoofing Vulnerability
## Executive Summary:
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0, .NET 9.0, and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A vulnerability exists in System.Net.Mail where specially crafted data allows an unauthorized attacker to perform a spoofing attack over the network.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/12345
## CVSS Details
- **Version:** 3.1
- **Severity:** High
- **Score:** 7.5
- **Vector:** 7.5: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
- **Weakness:** CWE-138: Improper Neutrali
No detection rules found.
No public exploits indexed.
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
Bugzilla
CVE-2026-32178 dotnet10.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] CVE-2026-32178 dotnet10.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
CVE-2026-32178 dotnet10.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [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-2026-32178 dotnet9.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] CVE-2026-32178 dotnet9.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
CVE-2026-32178 dotnet9.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [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-2026-32178 dotnet8.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
bugzilla·2026-04-14·CVSS 7.5
CVE-2026-32178 [HIGH] CVE-2026-32178 dotnet8.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [fedora-all]
CVE-2026-32178 dotnet8.0: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw [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-2026-32178 dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
bugzilla·2026-04-13·CVSS 7.5
CVE-2026-32178 [HIGH] CVE-2026-32178 dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
CVE-2026-32178 dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
Dotnet: SMTP Command Injection and Header Injection via MailAddress Parsing Flaw in System.Net.Mail
Affected .NET versions: 6.0, 8.0, 9.0, 10.0
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32178https://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-2026-32178https://bugzilla.redhat.com/show_bug.cgi?id=2457781https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32178.json
2026-04-14
Published