Vulnerability-Lookup

CVE-2026-42960 (GCVE-0-2026-42960)

Vulnerability from cvelistv5 – Published: 2026-05-20 09:21 – Updated: 2026-05-20 13:04

Title

Possible cache poisoning via promiscuous records for the authority section

Summary

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick Unbound to cache such records. If an adversary is able to attach such records in a reply (i.e., spoofed packet, fragmentation attack) he would be able to poison Unbound's cache. A malicious actor can exploit the possible poisonous effect by injecting RRSets other than NS that are also accompanied by address records in a reply, for example MX. This could be achieved by trying to spoof a reply packet or fragmentation attacks. Unbound would then accept the relative address records in the additional section and cache them if the authority RRSet has enough trust at this point, i.e., in-zone data for the delegation point. Unbound 1.25.1 contains a patch with a fix that disregards address records from the additional section if they are not explicitly relevant only to authority NS records, mitigating the possible poison effect. This is a complement fix to CVE-2025-11411.

Severity ?

5.7 (Medium)


                        
                          CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber

CWE

CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

Assigner

NLnet Labs

References

1 reference

URL	Tags
https://www.nlnetlabs.nl/downloads/unbound/CVE-20…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
NLnet Labs	Unbound	Affected: 0 , < 1.25.1 (semver)

Date Public ?

2026-05-20 00:00

Credits

TaoFei Guo (Peking University) Yang Luo (Tsinghua University) JianJun Chen (Tsinghua University)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-42960

Vulnerability from fkie_nvd - Published: 2026-05-20 10:16 - Updated: 2026-05-20 22:51

Severity ?

10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H

Summary

References

	URL	Tags
	sep@nlnetlabs.nl	https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42960.txt	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	nlnetlabs	unbound	*

JSON

To clipboard

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          "cpeMatch": [
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  "lastModified": "2026-05-20T22:51:43.680",
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GHSA-X7F7-RGGG-4JVV

Vulnerability from github – Published: 2026-05-20 12:30 – Updated: 2026-05-21 00:30

Details

Severity ?

10.0 (Critical)


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

5.7 (Medium)


                  
                    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
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  ],
  "database_specific": {
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    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-20T10:16:28Z",
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  },
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  "id": "GHSA-x7f7-rggg-4jvv",
  "modified": "2026-05-21T00:30:27Z",
  "published": "2026-05-20T12:30:37Z",
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    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42960"
    },
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    },
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber",
      "type": "CVSS_V4"
    }
  ]
}

WID-SEC-W-2026-1599

Vulnerability from csaf_certbund - Published: 2026-05-19 22:00 - Updated: 2026-05-20 22:00

Summary

Unbound: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

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: Unbound ist ein validierender, rekursiver DNS-Resolver.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Unbound ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux - UNIX

CVE-2026-32792

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-33278

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-40622

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-41292

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-42534

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-42923

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-42944

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-42959

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-42960

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-44390

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

CVE-2026-44608

Affected products

Known affected 4 products

Product	Identifier	Version
Red Hat Enterprise Linux Red Hat	`cpe:/o:redhat:enterprise_linux:-`	—
Open Source Unbound <1.25.1 Open Source / Unbound		<1.25.1
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

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://nlnetlabs.nl/news/2026/May/20/unbound-1.2…	external
https://ubuntu.com/security/notices/USN-8282-1	external
https://bodhi.fedoraproject.org/updates/FEDORA-20…	external
https://access.redhat.com/errata/RHSA-2026:19752	external
https://bodhi.fedoraproject.org/updates/FEDORA-20…	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": "Unbound ist ein validierender, rekursiver DNS-Resolver.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Unbound ausnutzen, um einen nicht n\u00e4her spezifizierten 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-2026-1599 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1599.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1599 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1599"
      },
      {
        "category": "external",
        "summary": "Unbound 1.25.1 release vom 2026-05-19",
        "url": "https://nlnetlabs.nl/news/2026/May/20/unbound-1.25.1-released/"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-8282-1 vom 2026-05-20",
        "url": "https://ubuntu.com/security/notices/USN-8282-1"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-3223DED15E vom 2026-05-20",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-3223ded15e"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2026:19752 vom 2026-05-20",
        "url": "https://access.redhat.com/errata/RHSA-2026:19752"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-49F37E16AA vom 2026-05-20",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-49f37e16aa"
      }
    ],
    "source_lang": "en-US",
    "title": "Unbound: Mehrere Schwachstellen erm\u00f6glichen nicht spezifizierten Angriff",
    "tracking": {
      "current_release_date": "2026-05-20T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-21T07:35:44.356+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1599",
      "initial_release_date": "2026-05-19T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-19T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-05-20T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Open Source, Ubuntu, European Union Vulnerability Database, Fedora und Red Hat aufgenommen"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "74185",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c1.25.1",
                "product": {
                  "name": "Open Source Unbound \u003c1.25.1",
                  "product_id": "T054382"
                }
              },
              {
                "category": "product_version",
                "name": "1.25.1",
                "product": {
                  "name": "Open Source Unbound 1.25.1",
                  "product_id": "T054382-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:nlnetlabs:unbound:1.25.1"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Unbound"
          }
        ],
        "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-2026-32792",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-32792"
    },
    {
      "cve": "CVE-2026-33278",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-33278"
    },
    {
      "cve": "CVE-2026-40622",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-40622"
    },
    {
      "cve": "CVE-2026-41292",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-41292"
    },
    {
      "cve": "CVE-2026-42534",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-42534"
    },
    {
      "cve": "CVE-2026-42923",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-42923"
    },
    {
      "cve": "CVE-2026-42944",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-42944"
    },
    {
      "cve": "CVE-2026-42959",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-42959"
    },
    {
      "cve": "CVE-2026-42960",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-42960"
    },
    {
      "cve": "CVE-2026-44390",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-44390"
    },
    {
      "cve": "CVE-2026-44608",
      "product_status": {
        "known_affected": [
          "67646",
          "T054382",
          "T000126",
          "74185"
        ]
      },
      "release_date": "2026-05-19T22:00:00.000+00:00",
      "title": "CVE-2026-44608"
    }
  ]
}

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

CVE-2026-42960 (GCVE-0-2026-42960)

FKIE_CVE-2026-42960

GHSA-X7F7-RGGG-4JVV

WID-SEC-W-2026-1599

Tags

Sightings

Nomenclature