WID-SEC-W-2026-1332

Vulnerability from csaf_certbund - Published: 2026-05-03 22:00 - Updated: 2026-06-08 22:00
Summary
libssh2: Schwachstelle ermöglicht Denial of Service
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: libssh2 ist eine C Bibliothek für das Anbieten von SSH2 Diensten auf Client- und Serverseite. Sie kann genutzt werden, um aus der Ferne Programme auszuführen, Dateien zu übertragen oder als sicherer und transparenter Tunnel für entfernte Programme genutzt werden.
Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libssh2 ausnutzen, um einen Denial of Service Angriff durchzuführen.
Betroffene Betriebssysteme: - Linux - UNIX
CVE-2026-7598
Affected products
Product Identifier Version Remediation
Fedora Linux
Fedora
 cpe:/o:fedoraproject:fedora:- —
Red Hat Enterprise Linux
Red Hat
 cpe:/o:redhat:enterprise_linux:- —
Ubuntu Linux
Ubuntu
 cpe:/o:canonical:ubuntu_linux:- —
Amazon Linux 2
Amazon
 cpe:/o:amazon:linux_2:- —
Microsoft Azure Linux azl3
Microsoft / Azure Linux
 cpe:/o:microsoft:azure_linux:azl3 azl3
Open Source libssh2
Open Source
 cpe:/a:libssh2:libssh2:- —
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "libssh2 ist eine C Bibliothek f\u00fcr das Anbieten von SSH2 Diensten auf Client- und Serverseite. Sie kann genutzt werden, um aus der Ferne Programme auszuf\u00fchren, Dateien zu \u00fcbertragen oder als sicherer und transparenter Tunnel f\u00fcr entfernte Programme genutzt werden.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libssh2 ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1332 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1332.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1332 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1332"
      },
      {
        "category": "external",
        "summary": "EU Vulnerability Database vom 2026-05-03",
        "url": "https://euvd.enisa.europa.eu/enisa/EUVD-2026-26722"
      },
      {
        "category": "external",
        "summary": "libssh commit vom 2026-05-03",
        "url": "https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1"
      },
      {
        "category": "external",
        "summary": "Vuldb mit PoC vom 2026-04-15",
        "url": "https://vuldb.com/submit/805564"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2026:7021 vom 2026-05-11",
        "url": "https://access.redhat.com/errata/RHSA-2026:7021"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Update Guide vom 2026-05-12",
        "url": "https://msrc.microsoft.com/update-guide/"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-F87AC8187C vom 2026-05-22",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-f87ac8187c"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-1B9134CDC9 vom 2026-05-22",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-1b9134cdc9"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-EPEL-2026-E7B8776A02 vom 2026-05-22",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-e7b8776a02"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-EPEL-2026-AFD26AD447 vom 2026-05-22",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-afd26ad447"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-EPEL-2026-AFCB3443A1 vom 2026-05-22",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-afcb3443a1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-8309-1 vom 2026-05-26",
        "url": "https://ubuntu.com/security/notices/USN-8309-1"
      },
      {
        "category": "external",
        "summary": "Amazon Linux Security Advisory ALAS2-2026-3329 vom 2026-06-09",
        "url": "https://alas.aws.amazon.com/AL2/ALAS2-2026-3329.html"
      }
    ],
    "source_lang": "en-US",
    "title": "libssh2: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2026-06-08T22:00:00.000+00:00",
      "generator": {
        "date": "2026-06-09T09:02:20.838+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1332",
      "initial_release_date": "2026-05-03T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-03T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-05-10T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2026-05-11T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates aufgenommen"
        },
        {
          "date": "2026-05-25T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Fedora aufgenommen"
        },
        {
          "date": "2026-05-26T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2026-06-08T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von Amazon aufgenommen"
        }
      ],
      "status": "final",
      "version": "6"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Amazon Linux 2",
            "product": {
              "name": "Amazon Linux 2",
              "product_id": "398363",
              "product_identification_helper": {
                "cpe": "cpe:/o:amazon:linux_2:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Amazon"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "T054551",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "azl3",
                "product": {
                  "name": "Microsoft Azure Linux azl3",
                  "product_id": "T049210",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:microsoft:azure_linux:azl3"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Open Source libssh2",
            "product": {
              "name": "Open Source libssh2",
              "product_id": "T053478",
              "product_identification_helper": {
                "cpe": "cpe:/a:libssh2:libssh2:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Red Hat Enterprise Linux",
            "product": {
              "name": "Red Hat Enterprise Linux",
              "product_id": "67646",
              "product_identification_helper": {
                "cpe": "cpe:/o:redhat:enterprise_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T000126",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-7598",
      "product_status": {
        "known_affected": [
          "T054551",
          "67646",
          "T000126",
          "398363",
          "T049210",
          "T053478"
        ]
      },
      "release_date": "2026-05-03T22:00:00.000+00:00",
      "title": "CVE-2026-7598"
    }
  ]
}


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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.