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

oracle_linux ELSA-2026-8473: ELSA-2026-8473:  .NET 10.0 security update (IMPORTANT)

oracle_linux ELSA-2026-8475: ELSA-2026-8475:  .NET 9.0 security update (IMPORTANT)

alma_linux ALSA-2026:8469: ALSA-2026:8469: .NET 8.0 security update (High)

alma_linux ALSA-2026:8472: ALSA-2026:8472: .NET 9.0 security update (High)

alma_linux ALSA-2026:8470: ALSA-2026:8470: .NET 8.0 security update (High)

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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8474 advisory.

    [9.0.116-1.0.1]
    - Add support for Oracle Linux

    [9.0.116-1]
    - Update to .NET SDK 9.0.116 and Runtime 9.0.15
    - Resolves: RHEL-163394

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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8472 advisory.

    [9.0.116-1.0.1]
    - Add support for Oracle Linux

    [9.0.116-1]
    - Update to .NET SDK 9.0.116 and Runtime 9.0.15
    - Resolves: RHEL-163396

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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8467 advisory.

    [10.0.106-1.0.1]
    - Add support for Oracle Linux

    [10.0.106-1]
    - Update to .NET SDK 10.0.106 and Runtime 10.0.6
    - Resolves: RHEL-163385

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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8471 advisory.

    [10.0.106-1.0.1]
    - Add support for Oracle Linux

    [10.0.106-1]
    - Update to .NET SDK 10.0.106 and Runtime 10.0.6
    - Resolves: RHEL-163384

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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-8470 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-163417

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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8475 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 9.0.116 and .NET Runtime 9.0.15.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-2026:8467 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8473 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 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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8474 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 9.0.116 and .NET Runtime 9.0.15.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-2026:8469 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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:8468 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 SDK_VERSION and .NET Runtime RUNTIME_VERSION.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-2026:8472 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 9.0.116 and .NET Runtime 9.0.15.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 Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8176-1 advisory.

    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-2026-32178)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
307353	Microsoft .NET Core (April 2026)	Nessus	Windows	high
307021	Oracle Linux 9 : .NET / 9.0 (ELSA-2026-8474)	Nessus	Oracle Linux Local Security Checks	high
307020	Oracle Linux 10 : .NET / 9.0 (ELSA-2026-8472)	Nessus	Oracle Linux Local Security Checks	high
307016	Oracle Linux 10 : .NET / 10.0 (ELSA-2026-8467)	Nessus	Oracle Linux Local Security Checks	high
307015	Oracle Linux 9 : .NET / 10.0 (ELSA-2026-8471)	Nessus	Oracle Linux Local Security Checks	high
307014	Oracle Linux 10 : .NET / 8.0 (ELSA-2026-8470)	Nessus	Oracle Linux Local Security Checks	high
306792	RHEL 8 : .NET 9.0 (RHSA-2026:8475)	Nessus	Red Hat Local Security Checks	high
306790	RHEL 10 : .NET 10.0 (RHSA-2026:8467)	Nessus	Red Hat Local Security Checks	high
306786	RHEL 8 : .NET 10.0 (RHSA-2026:8473)	Nessus	Red Hat Local Security Checks	high
306773	RHEL 9 : .NET 10.0 (RHSA-2026:8471)	Nessus	Red Hat Local Security Checks	high
306771	RHEL 9 : .NET 9.0 (RHSA-2026:8474)	Nessus	Red Hat Local Security Checks	high
306770	RHEL 10 : .NET 8.0 (RHSA-2026:8470)	Nessus	Red Hat Local Security Checks	high
306768	RHEL 9 : .NET 8.0 (RHSA-2026:8469)	Nessus	Red Hat Local Security Checks	high
306766	RHEL 8 : .NET 8.0 (RHSA-2026:8468)	Nessus	Red Hat Local Security Checks	high
306763	RHEL 10 : .NET 9.0 (RHSA-2026:8472)	Nessus	Red Hat Local Security Checks	high
306722	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : .NET vulnerabilities (USN-8176-1)	Nessus	Ubuntu Local Security Checks	high
306472	Linux Distros Unpatched Vulnerability : CVE-2026-33116	Nessus	Misc.	high

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