CERTFR-2026-AVI-0586

Vulnerability from certfr_avis - Published: 2026-05-13 - Updated: 2026-05-13

De multiples vulnérabilités ont été découvertes dans Microsoft .Net. Elles permettent à un attaquant de provoquer une élévation de privilèges et un déni de service à distance.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products
Vendor Product Description
Microsoft N/A .NET 9.0 sur Mac OS versions antérieures à 9.0.16
Microsoft N/A Microsoft .NET Framework 3.5 et 4.8.1 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A .NET 8.0 sur Linux versions antérieures à 8.0.27
Microsoft N/A Microsoft .NET Framework 3.5 et 4.8 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A .NET 8.0 sur Mac OS versions antérieures à 8.0.27
Microsoft N/A .NET 10.0 installed sur Windows versions antérieures à 10.0.8
Microsoft N/A .NET 8.0 sur Windows versions antérieures à 8.0.27
Microsoft N/A .NET 9.0 sur Linux versions antérieures à 9.0.16
Microsoft N/A .NET 10.0 sur Mac OS versions antérieures à 10.0.8
Microsoft N/A Microsoft .NET Framework 4.8 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A Microsoft .NET Framework 3.5 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A Microsoft .NET Framework 3.5 et 4.7.2 versions antérieures à 4.8.9334.0 et 4.8.4802.0
Microsoft N/A .NET 9.0 sur Windows versions antérieures à 9.0.16
Microsoft N/A .NET 10.0 sur Linux versions antérieures à 10.0.8
References

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{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": ".NET 9.0 sur Mac OS versions ant\u00e9rieures \u00e0 9.0.16",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 3.5 et 4.8.1 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 8.0 sur Linux versions ant\u00e9rieures \u00e0 8.0.27",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 3.5 et 4.8 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 8.0 sur Mac OS versions ant\u00e9rieures \u00e0 8.0.27",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 10.0 installed sur Windows versions ant\u00e9rieures \u00e0 10.0.8",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 8.0 sur Windows versions ant\u00e9rieures \u00e0 8.0.27",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 9.0 sur Linux versions ant\u00e9rieures \u00e0 9.0.16",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 10.0 sur Mac OS versions ant\u00e9rieures \u00e0 10.0.8",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 4.8 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 3.5 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft .NET Framework 3.5 et 4.7.2 versions ant\u00e9rieures \u00e0 4.8.9334.0 et 4.8.4802.0",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 9.0 sur Windows versions ant\u00e9rieures \u00e0 9.0.16",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": ".NET 10.0 sur Linux versions ant\u00e9rieures \u00e0 10.0.8",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-42899",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42899"
    },
    {
      "name": "CVE-2026-32177",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-32177"
    }
  ],
  "initial_release_date": "2026-05-13T00:00:00",
  "last_revision_date": "2026-05-13T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0586",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-05-13T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    },
    {
      "description": "\u00c9l\u00e9vation de privil\u00e8ges"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Microsoft .Net. Elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges et un d\u00e9ni de service \u00e0 distance.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Microsoft .Net",
  "vendor_advisories": [
    {
      "published_at": "2026-05-12",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft .Net CVE-2026-42899",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899"
    },
    {
      "published_at": "2026-05-12",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft .Net CVE-2026-32177",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32177"
    }
  ]
}


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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.