GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-19662 (GCVE-0-2026-19662)

Vulnerability from cvelistv5 – Published: 2026-09-16 13:50 – Updated: 2026-09-17 18:45
VLAI
Title
qpcache NOQNAME proof use-after-free crashes recursive resolver
Summary
An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 18:44 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
ISC BIND 9 Affected: 9.11.0 , ≤ 9.18.50 (custom)
Affected: 9.20.0 , ≤ 9.20.27 (custom)
Affected: 9.11.3-S1 , ≤ 9.18.50-S1 (custom)
Affected: 9.20.9-S1 , ≤ 9.20.27-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:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-16 00:00
Credits
ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19662",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-17T18:44:50.752130Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-17T18:45:11.717Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.18.50",
              "status": "affected",
              "version": "9.11.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.20.27",
              "status": "affected",
              "version": "9.20.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.50-S1",
              "status": "affected",
              "version": "9.11.3-S1",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.20.27-S1",
              "status": "affected",
              "version": "9.20.9-S1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.18.50",
                  "versionStartIncluding": "9.11.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.20.27",
                  "versionStartIncluding": "9.20.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.18.50-S1",
                  "versionStartIncluding": "9.11.3-S1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.20.27-S1",
                  "versionStartIncluding": "9.20.9-S1",
                  "vulnerable": true
                }
              ],
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention."
        }
      ],
      "datePublic": "2026-09-16T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "We are not aware of any active exploits."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A successful attack may result in unexpected program exit and a denial-of-service."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416 Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T13:50:10.432Z",
        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
      },
      "references": [
        {
          "name": "CVE-2026-19662",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kb.isc.org/docs/cve-2026-19662"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://downloads.isc.org/isc/bind9/9.20.29"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29 or 9.20.29-S1."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "qpcache NOQNAME proof use-after-free crashes recursive 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-2026-19662",
    "datePublished": "2026-09-16T13:50:10.432Z",
    "dateReserved": "2026-08-12T20:13:09.206Z",
    "dateUpdated": "2026-09-17T18:45:11.717Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-19662",
      "date": "2026-09-18",
      "epss": "0.00414",
      "percentile": "0.35359"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "BIND 9",
                "vendor": "ISC",
                "versions": [
                  {
                    "lessThanOrEqual": "9.18.50",
                    "status": "affected",
                    "version": "9.11.0",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "9.20.27",
                    "status": "affected",
                    "version": "9.20.0",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "9.18.50-S1",
                    "status": "affected",
                    "version": "9.11.3-S1",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "9.20.27-S1",
                    "status": "affected",
                    "version": "9.20.9-S1",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "security-officer@isc.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1."
          }
        ],
        "id": "CVE-2026-19662",
        "lastModified": "2026-09-17T19:16:41.783",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 3.6,
              "source": "security-officer@isc.org",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-19662",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-17T18:44:50.752130Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-09-16T14:17:04.900",
        "references": [
          {
            "source": "security-officer@isc.org",
            "url": "https://downloads.isc.org/isc/bind9/9.20.29"
          },
          {
            "source": "security-officer@isc.org",
            "url": "https://kb.isc.org/docs/cve-2026-19662"
          }
        ],
        "sourceIdentifier": "security-officer@isc.org",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "security-officer@isc.org",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-17T10:14:25+00:00",
      "cve": "CVE-2026-19662",
      "id": "CVE-2026-19662",
      "initial_release_date": "2026-09-16T13:50:10.432000+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "bind9: bind: BIND 9: Denial of Service via crafted DNSSEC responses",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19662.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-19662",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-09-17T18:44:50.752130Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-09-17T18:44:59.011Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "BIND 9",
              "vendor": "ISC",
              "versions": [
                {
                  "lessThanOrEqual": "9.18.50",
                  "status": "affected",
                  "version": "9.11.0",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "9.20.27",
                  "status": "affected",
                  "version": "9.20.0",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "9.18.50-S1",
                  "status": "affected",
                  "version": "9.11.3-S1",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "9.20.27-S1",
                  "status": "affected",
                  "version": "9.20.9-S1",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.18.50",
                      "versionStartIncluding": "9.11.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.20.27",
                      "versionStartIncluding": "9.20.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.18.50-S1",
                      "versionStartIncluding": "9.11.3-S1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.20.27-S1",
                      "versionStartIncluding": "9.20.9-S1",
                      "vulnerable": true
                    }
                  ],
                  "operator": "OR"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention."
            }
          ],
          "datePublic": "2026-09-16T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "We are not aware of any active exploits."
            }
          ],
          "impacts": [
            {
              "descriptions": [
                {
                  "lang": "en",
                  "value": "A successful attack may result in unexpected program exit and a denial-of-service."
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416 Use After Free",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-16T13:50:10.432Z",
            "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
            "shortName": "isc"
          },
          "references": [
            {
              "name": "CVE-2026-19662",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://kb.isc.org/docs/cve-2026-19662"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://downloads.isc.org/isc/bind9/9.20.29"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29 or 9.20.29-S1."
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "qpcache NOQNAME proof use-after-free crashes recursive 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-2026-19662",
        "datePublished": "2026-09-16T13:50:10.432Z",
        "dateReserved": "2026-08-12T20:13:09.206Z",
        "dateUpdated": "2026-09-16T13:50:10.432Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


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.