The Microsoft .NET Core installations on the remote host are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - Denial of Service (CVE-2026-26171, CVE-2026-32203, CVE-2026-33116)

  - Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network. (CVE-2026-32178)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:8472 advisory.

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8469 advisory.

    [8.0.126-1.0.1]
    - Add support for Oracle Linux

    [8.0.126-1]
    - Update to .NET SDK 8.0.126 and Runtime 8.0.26
    - Resolves: RHEL-163416

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:8472 advisory.

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)
      * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)
      * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)
      * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8469 advisory.

    .NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new     APIs, and it includes a CLR implementation.

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 8.0.126 and .NET Runtime 8.0.26.Security Fix(es):

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8470 advisory.

    .NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new     APIs, and it includes a CLR implementation.

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 8.0.126 and .NET Runtime 8.0.26.Security Fix(es):

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8471 advisory.

    .NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new     APIs, and it includes a CLR implementation.

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 10.0.106 and .NET Runtime 10.0.6.Security Fix(es):

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:8468 advisory.

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:8474 advisory.

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13693 advisory.

    .NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new     APIs, and it includes a CLR implementation.

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 8.0.126 and .NET Runtime 8.0.26.Security Fix(es):

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)

    * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)

    * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)

    * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1629 advisory.

    Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.
    (CVE-2026-26171)

    Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing     over a network. (CVE-2026-32178)

    Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over     a network. (CVE-2026-32203)

    Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an     unauthorized attacker to deny service over a network. (CVE-2026-33116)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:8468 advisory.

    * dotnet: .NET: Security Bypass and Denial of Service Vulnerability (CVE-2026-26171)
      * dotnet: .NET: Denial of Service via stack overflow (CVE-2026-32203)
      * dotnet: .NET: Denial of Service via Infinite Recursion in XmlDecryptionTransform (CVE-2026-33116)
      * dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw     (CVE-2026-32178)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-02b2a30c02 advisory.

    Update to .NET SDK 8.0.126 and Runtime 8.0.26

    Fixes: CVE-2026-26171, CVE-2026-32178, CVE-2026-32203, CVE-2026-33116

    Release Notes:

    - SDK: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.26/8.0.126.md
    - Runtime: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.26/8.0.26.md

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a1302c450c advisory.

    Update to .NET SDK 8.0.126 and Runtime 8.0.26

    Fixes: CVE-2026-26171, CVE-2026-32178, CVE-2026-32203, CVE-2026-33116

    Release Notes:

    - SDK: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.26/8.0.126.md
    - Runtime: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.26/8.0.26.md

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
307353	Microsoft .NET Core (April 2026)	Nessus	Windows	4/17/2026	5/8/2026	high
307472	RockyLinux 10 : .NET 9.0 (RLSA-2026:8472)	Nessus	Rocky Linux Local Security Checks	4/18/2026	5/7/2026	high
307664	Oracle Linux 9 : .NET / 8.0 (ELSA-2026-8469)	Nessus	Oracle Linux Local Security Checks	4/20/2026	5/7/2026	high
309078	AlmaLinux 10 : .NET 9.0 (ALSA-2026:8472)	Nessus	Alma Linux Local Security Checks	4/21/2026	5/7/2026	high
306768	RHEL 9 : .NET 8.0 (RHSA-2026:8469)	Nessus	Red Hat Local Security Checks	4/16/2026	5/8/2026	high
306770	RHEL 10 : .NET 8.0 (RHSA-2026:8470)	Nessus	Red Hat Local Security Checks	4/16/2026	5/8/2026	high
306773	RHEL 9 : .NET 10.0 (RHSA-2026:8471)	Nessus	Red Hat Local Security Checks	4/16/2026	5/8/2026	high
307470	RockyLinux 8 : .NET 8.0 (RLSA-2026:8468)	Nessus	Rocky Linux Local Security Checks	4/18/2026	5/7/2026	high
307475	RockyLinux 9 : .NET 9.0 (RLSA-2026:8474)	Nessus	Rocky Linux Local Security Checks	4/18/2026	5/7/2026	high
312174	RHEL 9 : .NET 8.0 (RHSA-2026:13693)	Nessus	Red Hat Local Security Checks	5/5/2026	5/7/2026	high
311302	Amazon Linux 2023 : aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 (ALAS2023-2026-1629)	Nessus	Amazon Linux Local Security Checks	4/30/2026	5/7/2026	high
307560	AlmaLinux 8 : .NET 8.0 (ALSA-2026:8468)	Nessus	Alma Linux Local Security Checks	4/20/2026	5/7/2026	high
311392	Fedora 42 : dotnet8.0 (2026-02b2a30c02)	Nessus	Fedora Local Security Checks	5/1/2026	5/7/2026	high
311395	Fedora 43 : dotnet8.0 (2026-a1302c450c)	Nessus	Fedora Local Security Checks	5/1/2026	5/7/2026	high

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