Vulnerability-Lookup

WID-SEC-W-2026-1508

Vulnerability from csaf_certbund - Published: 2026-05-12 22:00 - Updated: 2026-06-14 22:00

Summary

Samba: 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: Samba ist eine Open Source Software Suite, die Druck- und Dateidienste für SMB/CIFS Clients implementiert.

Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Samba ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux - UNIX

CVE-2026-40170

Affected products

Known affected 3 products

Product	Identifier	Version
Open Source Samba <4.24.2 Open Source / Samba		<4.24.2
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
RESF Rocky Linux RESF	`cpe:/o:resf:rocky_linux:-`	—

References

7 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://www.samba.org/samba/history/samba-4.24.2.html	external
https://access.redhat.com/errata/RHSA-2026:22963	external
https://access.redhat.com/errata/RHSA-2026:25049	external
https://errata.build.resf.org/RLSA-2026:22963	external
https://errata.build.resf.org/RLSA-2026:25049	external

JSON

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": "Samba ist eine Open Source Software Suite, die Druck- und Dateidienste f\u00fcr SMB/CIFS Clients implementiert.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Samba 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-2026-1508 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1508.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1508 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1508"
      },
      {
        "category": "external",
        "summary": "Samba Release Notes vom 2026-05-12",
        "url": "https://www.samba.org/samba/history/samba-4.24.2.html"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2026:22963 vom 2026-06-03",
        "url": "https://access.redhat.com/errata/RHSA-2026:22963"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2026:25049 vom 2026-06-10",
        "url": "https://access.redhat.com/errata/RHSA-2026:25049"
      },
      {
        "category": "external",
        "summary": "Rocky Linux Security Advisory RLSA-2026:22963 vom 2026-06-11",
        "url": "https://errata.build.resf.org/RLSA-2026:22963"
      },
      {
        "category": "external",
        "summary": "Rocky Linux Security Advisory RLSA-2026:25049 vom 2026-06-13",
        "url": "https://errata.build.resf.org/RLSA-2026:25049"
      }
    ],
    "source_lang": "en-US",
    "title": "Samba: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2026-06-14T22:00:00.000+00:00",
      "generator": {
        "date": "2026-06-15T08:01:04.134+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1508",
      "initial_release_date": "2026-05-12T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-12T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-06-04T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2026-06-10T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2026-06-11T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Rocky Enterprise Software Foundation aufgenommen"
        },
        {
          "date": "2026-06-14T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Rocky Enterprise Software Foundation aufgenommen"
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c4.24.2",
                "product": {
                  "name": "Open Source Samba \u003c4.24.2",
                  "product_id": "T053927"
                }
              },
              {
                "category": "product_version",
                "name": "4.24.2",
                "product": {
                  "name": "Open Source Samba 4.24.2",
                  "product_id": "T053927-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:samba:samba:4.24.2"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Samba"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "RESF Rocky Linux",
            "product": {
              "name": "RESF Rocky Linux",
              "product_id": "T032255",
              "product_identification_helper": {
                "cpe": "cpe:/o:resf:rocky_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "RESF"
      },
      {
        "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"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-40170",
      "product_status": {
        "known_affected": [
          "T053927",
          "67646",
          "T032255"
        ]
      },
      "release_date": "2026-05-12T22:00:00.000+00:00",
      "title": "CVE-2026-40170"
    }
  ]
}

CVE-2026-40170 (GCVE-0-2026-40170)

Vulnerability from cvelistv5 – Published: 2026-04-16 21:34 – Updated: 2026-04-20 15:00

Title

ngtcp2 has a qlog transport parameter serialization stack buffer overflow

Summary

ngtcp2 is a C implementation of the IETF QUIC protocol. In versions prior to 1.22.1, ngtcp2_qlog_parameters_set_transport_params() serializes peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog is enabled, a remote peer can send sufficiently large transport parameters during the QUIC handshake to cause writes beyond the buffer boundary, resulting in a stack buffer overflow. This affects deployments that enable the qlog callback and process untrusted peer transport parameters. This issue has been fixed in version 1.22.1. If developers are unable to immediately upgrade, they can disable the qlog on client.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/ngtcp2/ngtcp2/security/advisor…	x_refsource_CONFIRM
https://github.com/ngtcp2/ngtcp2/commit/708a7640c…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
ngtcp2	ngtcp2	Affected: < 1.22.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-04-17T18:17:35.758Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/17/12"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40170",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-17T14:52:12.292330Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-20T15:00:26.193Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/ngtcp2/ngtcp2/security/advisories/GHSA-f523-465f-8c8f"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ngtcp2",
          "vendor": "ngtcp2",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.22.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ngtcp2 is a C implementation of the IETF QUIC protocol. In versions prior to 1.22.1, ngtcp2_qlog_parameters_set_transport_params() serializes peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog is enabled, a remote peer can send sufficiently large transport parameters during the QUIC handshake to cause writes beyond the buffer boundary, resulting in a stack buffer overflow. This affects deployments that enable the qlog callback and process untrusted peer transport parameters. This issue has been fixed in version 1.22.1. If developers are unable to immediately upgrade, they can disable the qlog on client."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "CWE-121: Stack-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-16T21:34:07.610Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ngtcp2/ngtcp2/security/advisories/GHSA-f523-465f-8c8f",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ngtcp2/ngtcp2/security/advisories/GHSA-f523-465f-8c8f"
        },
        {
          "name": "https://github.com/ngtcp2/ngtcp2/commit/708a7640c1f48fb8ffb540c4b8ea5b4c1dfb8ee5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ngtcp2/ngtcp2/commit/708a7640c1f48fb8ffb540c4b8ea5b4c1dfb8ee5"
        }
      ],
      "source": {
        "advisory": "GHSA-f523-465f-8c8f",
        "discovery": "UNKNOWN"
      },
      "title": "ngtcp2 has a qlog transport parameter serialization stack buffer overflow"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40170",
    "datePublished": "2026-04-16T21:34:07.610Z",
    "dateReserved": "2026-04-09T19:31:56.015Z",
    "dateUpdated": "2026-04-20T15:00:26.193Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

WID-SEC-W-2026-1508

CVE-2026-40170 (GCVE-0-2026-40170)

Tags

Sightings

Nomenclature