rlsa-2026:54590
Vulnerability from osv_rocky
Published
2026-08-14 12:06
Modified
2026-08-23 18:09
Summary
Important: .NET 9.0 security, bug fix, and enhancement update
Details

.NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows. It particularly focuses on creating console applications, web applications and micro-services. .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a 'dotnet' application to drive everything.

SDK version: 9.0.120 Runtime version: 9.0.19

Security Fix(es):

  • .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)

  • .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)

  • .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)

  • .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

Bug Fix(es) and Enhancement(s):

  • Update .NET 9.0 to SDK 9.0.120 and Runtime 9.0.19 [rhel-10.2.z] (JIRA:Rocky Linux-235477)

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.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Credits
Rocky Enterprise Software Foundation
Red Hat
References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "dotnet9.0",
        "purl": "pkg:rpm/rocky-linux/dotnet9.0?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:9.0.120-1.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:54590"
  },
  "details": ".NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows.  It particularly focuses on creating console applications, web applications and micro-services.  .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a \u0027dotnet\u0027 application to drive everything.\n\nSDK version: 9.0.120\nRuntime version: 9.0.19\n\nSecurity Fix(es):\n\n* .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)\n\n* .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)\n\n* .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)\n\n* .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)\n\nBug Fix(es) and Enhancement(s):\n\n* Update .NET 9.0 to SDK 9.0.120 and Runtime 9.0.19 [rhel-10.2.z] (JIRA:Rocky Linux-235477)\n\nFor 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.",
  "id": "RLSA-2026:54590",
  "modified": "2026-08-23T18:09:39.060943Z",
  "published": "2026-08-14T12:06:50.872780Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:54590"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512180"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512185"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512175"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512179"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:54590"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: .NET 9.0 security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2026-62899",
    "CVE-2026-62900",
    "CVE-2026-62901",
    "CVE-2026-62909"
  ]
}



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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.


Detection rules are retrieved from Rulezet.