RHSA-2026:39952

Vulnerability from csaf_redhat - Published: 2026-07-15 11:58 - Updated: 2026-09-06 23:22
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: dotnet9.0: * aspnetcore-runtime-9.0-9.0.18-1.hum1 (aarch64, x86_64) * aspnetcore-runtime-dbg-9.0-9.0.18-1.hum1 (aarch64, x86_64) * aspnetcore-targeting-pack-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-apphost-pack-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-hostfxr-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-runtime-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-runtime-dbg-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-sdk-9.0-9.0.119-1.hum1 (aarch64, x86_64) * dotnet-sdk-9.0-source-built-artifacts-9.0.119-1.hum1 (aarch64, x86_64) * dotnet-sdk-aot-9.0-9.0.119-1.hum1 (aarch64, x86_64) * dotnet-sdk-dbg-9.0-9.0.119-1.hum1 (aarch64, x86_64) * dotnet-targeting-pack-9.0-9.0.18-1.hum1 (aarch64, x86_64) * dotnet-templates-9.0-9.0.119-1.hum1 (aarch64, x86_64) * netstandard-targeting-pack-2.1-9.0.119-1.hum1 (aarch64, x86_64) * dotnet9.0-9.0.119-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-47300

A flaw was found in ASP.NET Core. An authorized attacker can exploit an incorrect implementation of the authentication algorithm over a network. This vulnerability allows the attacker to elevate their privileges, potentially gaining unauthorized access to sensitive resources or performing actions beyond their intended permissions.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-303 - Incorrect Implementation of Authentication Algorithm
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:dotnet9-0-main@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:dotnet9-0-main@src —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:dotnet9-0-main@x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-47303

A flaw was found in ASP.NET Core. An authorized attacker can exploit this authentication bypass vulnerability over a network by manipulating assumed-immutable data. This can allow the attacker to elevate their privileges within the system.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-472 - External Control of Assumed-Immutable Web Parameter
Affected products
Fixed 3 products, the same list as for CVE-2026-47300
Threats
Impact Important
CVE-2026-47304

A flaw was found in .NET. An unauthorized attacker can exploit this vulnerability over a network due to improper verification of cryptographic signatures. This allows the attacker to bypass a critical security feature, potentially leading to significant compromise of confidentiality, integrity, and availability.

8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-347 - Improper Verification of Cryptographic Signature
Affected products
Fixed 3 products, the same list as for CVE-2026-47300
Threats
Impact Important
CVE-2026-50659

A flaw was found in .NET. An authorized attacker can exploit this vulnerability by leveraging improper encoding or escaping of output. This allows the attacker to perform spoofing over a network, potentially deceiving users or systems into believing they are interacting with a trusted entity.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE-838 - Inappropriate Encoding for Output Context
Affected products
Fixed 3 products, the same list as for CVE-2026-47300
Threats
Impact Moderate
CVE-2026-56170

A flaw was found in ASP.NET Core. This vulnerability allows an unauthorized remote attacker to cause a Denial of Service (DoS) by allocating resources without proper limits or throttling. This can lead to the affected system becoming unresponsive or unavailable to legitimate users.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 3 products, the same list as for CVE-2026-47300
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:39952 self
https://images.redhat.com/ external
https://access.redhat.com/security/cve/CVE-2026-56170 external
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/security/cve/CVE-2026-50659 external
https://access.redhat.com/security/cve/CVE-2026-47303 external
https://access.redhat.com/security/cve/CVE-2026-47300 external
https://access.redhat.com/security/cve/CVE-2026-47304 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-47300 self
https://bugzilla.redhat.com/show_bug.cgi?id=2500492 external
https://www.cve.org/CVERecord?id=CVE-2026-47300 external
https://nvd.nist.gov/vuln/detail/CVE-2026-47300 external
https://msrc.microsoft.com/update-guide/vulnerabi… external
https://access.redhat.com/security/cve/CVE-2026-47303 self
https://bugzilla.redhat.com/show_bug.cgi?id=2500502 external
https://www.cve.org/CVERecord?id=CVE-2026-47303 external
https://nvd.nist.gov/vuln/detail/CVE-2026-47303 external
https://msrc.microsoft.com/update-guide/vulnerabi… external
https://access.redhat.com/security/cve/CVE-2026-47304 self
https://bugzilla.redhat.com/show_bug.cgi?id=2500509 external
https://www.cve.org/CVERecord?id=CVE-2026-47304 external
https://nvd.nist.gov/vuln/detail/CVE-2026-47304 external
https://msrc.microsoft.com/update-guide/vulnerabi… external
https://access.redhat.com/security/cve/CVE-2026-50659 self
https://bugzilla.redhat.com/show_bug.cgi?id=2500589 external
https://www.cve.org/CVERecord?id=CVE-2026-50659 external
https://nvd.nist.gov/vuln/detail/CVE-2026-50659 external
https://msrc.microsoft.com/update-guide/vulnerabi… external
https://access.redhat.com/security/cve/CVE-2026-56170 self
https://bugzilla.redhat.com/show_bug.cgi?id=2500189 external
https://www.cve.org/CVERecord?id=CVE-2026-56170 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56170 external
https://msrc.microsoft.com/update-guide/vulnerabi… external
To clipboard 

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      "discovery_date": "2026-07-14T19:01:28.027271+00:00",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm"
    },
    {
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      "cwe": {
        "id": "CWE-472",
        "name": "External Control of Assumed-Immutable Web Parameter"
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      "discovery_date": "2026-07-14T19:03:32.877670+00:00",
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          "title": "Vulnerability description"
        },
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          "text": "ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:39952"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass"
    },
    {
      "cve": "CVE-2026-47304",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
      },
      "discovery_date": "2026-07-14T19:04:28.997604+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2500509"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in .NET. An unauthorized attacker can exploit this vulnerability over a network due to improper verification of cryptographic signatures. This allows the attacker to bypass a critical security feature, potentially leading to significant compromise of confidentiality, integrity, and availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dotnet: .NET Security Feature Bypass Vulnerability",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:dotnet9-0-main@aarch64",
          "Red Hat Hardened Images:dotnet9-0-main@src",
          "Red Hat Hardened Images:dotnet9-0-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-47304"
        },
        {
          "category": "external",
          "summary": "RHBZ#2500509",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500509"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-47304",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-47304"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47304",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47304"
        },
        {
          "category": "external",
          "summary": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47304",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47304"
        }
      ],
      "release_date": "2026-07-14T18:45:33.914000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-15T11:58:50+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:39952"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dotnet: .NET Security Feature Bypass Vulnerability"
    },
    {
      "cve": "CVE-2026-50659",
      "cwe": {
        "id": "CWE-838",
        "name": "Inappropriate Encoding for Output Context"
      },
      "discovery_date": "2026-07-14T20:04:53.048725+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2500589"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in .NET. An authorized attacker can exploit this vulnerability by leveraging improper encoding or escaping of output. This allows the attacker to perform spoofing over a network, potentially deceiving users or systems into believing they are interacting with a trusted entity.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": ".NET: .NET: Network Spoofing Vulnerability",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:dotnet9-0-main@aarch64",
          "Red Hat Hardened Images:dotnet9-0-main@src",
          "Red Hat Hardened Images:dotnet9-0-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50659"
        },
        {
          "category": "external",
          "summary": "RHBZ#2500589",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500589"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50659",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50659"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50659",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50659"
        },
        {
          "category": "external",
          "summary": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659"
        }
      ],
      "release_date": "2026-07-14T19:40:15.949000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-15T11:58:50+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:39952"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": ".NET: .NET: Network Spoofing Vulnerability"
    },
    {
      "cve": "CVE-2026-56170",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-07-14T18:06:54.194809+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2500189"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in ASP.NET Core. This vulnerability allows an unauthorized remote attacker to cause a Denial of Service (DoS) by allocating resources without proper limits or throttling. This can lead to the affected system becoming unresponsive or unavailable to legitimate users.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:dotnet9-0-main@aarch64",
          "Red Hat Hardened Images:dotnet9-0-main@src",
          "Red Hat Hardened Images:dotnet9-0-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56170"
        },
        {
          "category": "external",
          "summary": "RHBZ#2500189",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500189"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56170",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56170"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56170",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56170"
        },
        {
          "category": "external",
          "summary": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56170",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56170"
        }
      ],
      "release_date": "2026-07-14T17:05:13.486000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-15T11:58:50+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:dotnet9-0-main@aarch64",
            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:39952"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:dotnet9-0-main@src",
            "Red Hat Hardened Images:dotnet9-0-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation"
    }
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.