Vulnerability-Lookup

CVE-2026-5950 (GCVE-0-2026-5950)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:10 – Updated: 2026-05-20 13:38

Title

Unbounded resend loop in BIND 9 resolver

Summary

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-20 13:38 UTC

CWE

CWE-606 - Unchecked Input for Loop Condition

Assigner

isc CNA under the mitre root

CNA scorecard A 95/100 over 33 records in the last 180 days details

References

4 references

URL	Tags
https://kb.isc.org/docs/cve-2026-5950	vendor-advisory
https://downloads.isc.org/isc/bind9/9.18.49	patch
https://downloads.isc.org/isc/bind9/9.20.23	patch
https://downloads.isc.org/isc/bind9/9.21.22	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
ISC	BIND 9	Affected: 9.18.36 , ≤ 9.18.48 (custom) Affected: 9.20.8 , ≤ 9.20.22 (custom) Affected: 9.21.7 , ≤ 9.21.21 (custom) Affected: 9.18.36-S1 , ≤ 9.18.48-S1 (custom) Affected: 9.20.9-S1 , ≤ 9.20.22-S1 (custom) cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind::::::::

Date Public

2026-05-20 00:00

Credits

ISC would like to thank Billy Baraja (BielraX) for bringing this vulnerability to our attention.

Show details on NVD website

JSON

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              "url": "https://downloads.isc.org/isc/bind9/9.18.49"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://downloads.isc.org/isc/bind9/9.20.23"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://downloads.isc.org/isc/bind9/9.21.22"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.49, 9.20.23, 9.21.22, 9.18.49-S1, or 9.20.23-S1."
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Unbounded resend loop in BIND 9 resolver",
          "workarounds": [
            {
              "lang": "en",
              "value": "No workarounds known."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "assignerShortName": "isc",
        "cveId": "CVE-2026-5950",
        "datePublished": "2026-05-20T13:10:19.989Z",
        "dateReserved": "2026-04-09T06:42:23.953Z",
        "dateUpdated": "2026-05-20T13:38:53.211Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

BELL-CVE-2026-5950 (CVE-2026-5950)

Vulnerability from osv_bellsoft – Published: 2026-05-21 06:10 – Updated: 2026-05-27 16:08 – Source website

Severity

5.3 (Medium)


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

References

URL

Type

https://docs.bell-sw.com/security/cves/CVE-2026-5950

ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Alpaquita:23",
        "name": "bind",
        "purl": "pkg:apk/alpaquita/bind?arch=source\u0026distro=23"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.18.11-r0"
            },
            {
              "fixed": "9.18.49-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:25",
        "name": "bind",
        "purl": "pkg:apk/alpaquita/bind?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.20.9-r0"
            },
            {
              "fixed": "9.20.23-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:stream",
        "name": "bind",
        "purl": "pkg:apk/alpaquita/bind?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.18.16-r0"
            },
            {
              "fixed": "9.20.23-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "id": "BELL-CVE-2026-5950",
  "modified": "2026-05-27T16:08:39.702431Z",
  "published": "2026-05-21T06:10:54.922628Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://docs.bell-sw.com/security/cves/CVE-2026-5950"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-5950"
  ]
}

CERTFR-2026-AVI-0626

Vulnerability from certfr_avis - Published: 2026-05-21 - Updated: 2026-05-21

De multiples vulnérabilités ont été découvertes dans ISC BIND. Elles permettent à un attaquant de provoquer un déni de service à distance et un problème de sécurité non spécifié par l'éditeur.

Solutions

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

Impacted products

Vendor	Product	Description
ISC	BIND	Bind versions 9.20.x antérieures à 9.20.23
ISC	BIND	Bind versions 9.x antérieures à 9.18.49
ISC	BIND	BIND Supported Preview Edition versions antérieures à 9.18.49-S1
ISC	BIND	Bind versions 9.21.x antérieures à 9.21.22
ISC	BIND	BIND Supported Preview Edition versions 9.20.x antérieures à 9.20.23-S1

References

Title

Publication Time

FKIE_CVE-2026-5950

Vulnerability from fkie_nvd - Published: 2026-05-20 13:16 - Updated: 2026-07-23 12:10

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

URL	Tags
security-officer@isc.org	https://downloads.isc.org/isc/bind9/9.18.49	Patch
security-officer@isc.org	https://downloads.isc.org/isc/bind9/9.20.23	Patch
security-officer@isc.org	https://downloads.isc.org/isc/bind9/9.21.22	Patch
security-officer@isc.org	https://kb.isc.org/docs/cve-2026-5950	Vendor Advisory

Impacted products

Vendor	Product	Version
isc	bind	*
isc	bind	*
isc	bind	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.18.48",
              "status": "affected",
              "version": "9.18.36",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.20.22",
              "status": "affected",
              "version": "9.20.8",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.21.21",
              "status": "affected",
              "version": "9.21.7",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.48-S1",
              "status": "affected",
              "version": "9.18.36-S1",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.20.22-S1",
              "status": "affected",
              "version": "9.20.9-S1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security-officer@isc.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "DB942412-011D-485F-AEB1-5A3F9BA84740",
              "versionEndExcluding": "9.18.49",
              "versionStartIncluding": "9.18.36",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "786BBEB0-8B23-45D4-B617-F6AE5BFD8119",
              "versionEndExcluding": "9.20.23",
              "versionStartIncluding": "9.20.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "CF4032B3-0505-4FC5-AA16-BB2086187785",
              "versionEndExcluding": "9.21.21",
              "versionStartIncluding": "9.21.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de bucle de reenv\u00edo ilimitado existe en la m\u00e1quina de estados del resolvedor de BIND 9 durante el manejo de servidores defectuosos, permitiendo a un atacante remoto no autenticado causar un agotamiento severo de recursos enviando consultas que activan condiciones de reintento espec\u00edficas.\nEste problema afecta a las versiones de BIND 9 9.18.36 a 9.18.48, 9.20.8 a 9.20.22, 9.21.7 a 9.21.21, 9.18.36-S1 a 9.18.48-S1, y 9.20.9-S1 a 9.20.22-S1."
    }
  ],
  "id": "CVE-2026-5950",
  "lastModified": "2026-07-23T12:10:00.110",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "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:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-officer@isc.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5950",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-20T13:38:40.421994Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-20T13:16:40.450",
  "references": [
    {
      "source": "security-officer@isc.org",
      "tags": [
        "Patch"
      ],
      "url": "https://downloads.isc.org/isc/bind9/9.18.49"
    },
    {
      "source": "security-officer@isc.org",
      "tags": [
        "Patch"
      ],
      "url": "https://downloads.isc.org/isc/bind9/9.20.23"
    },
    {
      "source": "security-officer@isc.org",
      "tags": [
        "Patch"
      ],
      "url": "https://downloads.isc.org/isc/bind9/9.21.22"
    },
    {
      "source": "security-officer@isc.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.isc.org/docs/cve-2026-5950"
    }
  ],
  "sourceIdentifier": "security-officer@isc.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-606"
        }
      ],
      "source": "security-officer@isc.org",
      "type": "Secondary"
    }
  ]
}

GHSA-2PJM-RCHF-GXMP

Vulnerability from github – Published: 2026-05-20 15:35 – Updated: 2026-05-20 15:35

Details

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-5950"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-606"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-20T13:16:40Z",
    "severity": "MODERATE"
  },
  "details": "An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.",
  "id": "GHSA-2pjm-rchf-gxmp",
  "modified": "2026-05-20T15:35:33Z",
  "published": "2026-05-20T15:35:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5950"
    },
    {
      "type": "WEB",
      "url": "https://downloads.isc.org/isc/bind9/9.18.49"
    },
    {
      "type": "WEB",
      "url": "https://downloads.isc.org/isc/bind9/9.20.23"
    },
    {
      "type": "WEB",
      "url": "https://downloads.isc.org/isc/bind9/9.21.22"
    },
    {
      "type": "WEB",
      "url": "https://kb.isc.org/docs/cve-2026-5950"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-5950

Vulnerability from csaf_microsoft - Published: 2026-05-02 00:00 - Updated: 2026-05-23 01:01

Summary

Unbounded resend loop in BIND 9 resolver

Scope

1 vulnerability in this advisory, including CVE-2026-5950.

CVE-2026-5950

5.3 (Medium)


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

Fixed: 1 product Known affected: 1 product

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:10874-1

Vulnerability from csaf_opensuse - Published: 2026-05-28 00:00 - Updated: 2026-09-17 17:06

Summary

bind-9.20.23-1.1 on GA media

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-5950.

CVE-2026-5950

5.3 (Medium)


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

Recommended: 36 products

Open the full advisory

OPENSUSE-SU-2026:21123-1

Vulnerability from csaf_opensuse - Published: 2026-06-20 06:54 - Updated: 2026-09-17 17:36

Summary

Security update for bind

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-5950.

CVE-2026-5950

5.3 (Medium)


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

Recommended: 33 products

Open the full advisory

RHSA-2026:20334

Vulnerability from csaf_redhat - Published: 2026-05-21 21:26 - Updated: 2026-11-07 05:55

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-5950.

CVE-2026-5950

A flaw was found in BIND 9. A remote, unauthenticated attacker can exploit an unbounded resend loop vulnerability in the resolver state machine during bad-server handling. By sending specially crafted queries that trigger specific retry conditions, the attacker can cause severe resource exhaustion, leading to a Denial of Service (DoS).

5.3 (Medium)


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

Fixed: 15 products

https://access.redhat.com/errata/RHSA-2026:20334

Open the full advisory

SUSE-SU-2026:22198-1

Vulnerability from csaf_suse - Published: 2026-06-20 06:53 - Updated: 2026-09-16 19:57

Summary

Security update for bind

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-5950.

CVE-2026-5950

5.3 (Medium)


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

Recommended: 58 products

Open the full advisory

SUSE-SU-2026:2676-1

Vulnerability from csaf_suse - Published: 2026-06-29 09:53 - Updated: 2026-09-17 16:26

Summary

Security update for bind

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-5950.

CVE-2026-5950

5.3 (Medium)


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

Recommended: 27 products

Open the full advisory

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-5950 (GCVE-0-2026-5950)

BELL-CVE-2026-5950 (CVE-2026-5950)

Solutions

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour