CVE-2026-3592 (GCVE-0-2026-3592)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:09 – Updated: 2026-05-20 13:42
VLAI
Title
Amplification vulnerabilities via self-pointed glue records
Summary
BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-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 13:42 UTC
CWE
  • CWE-408 - Incorrect Behavior Order - Early Amplification
Assigner
isc CNA under the mitre root
CNA scorecard A 95/100 over 33 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ISC BIND 9 Affected: 9.11.0 , ≤ 9.16.50 (custom)
Affected: 9.18.0 , ≤ 9.18.48 (custom)
Affected: 9.20.0 , ≤ 9.20.22 (custom)
Affected: 9.21.0 , ≤ 9.21.21 (custom)
Affected: 9.11.3-S1 , ≤ 9.16.50-S1 (custom)
Affected: 9.18.11-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:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-20 00:00
Credits
ISC would like to thank Shuhan Zhang from Tsinghua University for bringing this vulnerability to our attention.
Show details on NVD website
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                    },
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.18.48-S1",
                      "versionStartIncluding": "9.18.11-S1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                      "versionEndIncluding": "9.20.22-S1",
                      "versionStartIncluding": "9.20.9-S1",
                      "vulnerable": true
                    }
                  ],
                  "operator": "OR"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "ISC would like to thank Shuhan Zhang from Tsinghua University for bringing this vulnerability to our attention."
            }
          ],
          "datePublic": "2026-05-20T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack.  If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources.\nThis issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "We are not aware of any active exploits."
            }
          ],
          "impacts": [
            {
              "descriptions": [
                {
                  "lang": "en",
                  "value": "An attacker may be able to cause the resolver to consume disproportionate amounts of bandwidth in the attempt to resolve the name.  Impairment of TCP may also be seen.\nThe issue predominately affects recursive resolvers.  Authoritative-only servers containing only trustworthy zones and names should be unaffected.  If an authoritative server can be induced to look up an attack domain (e.g., if loading a zone from an untrusted source), it may be possible to trigger the issue."
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "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"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-408",
                  "description": "CWE-408 Incorrect Behavior Order - Early Amplification",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-20T13:09:21.547Z",
            "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
            "shortName": "isc"
          },
          "references": [
            {
              "name": "CVE-2026-3592",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://kb.isc.org/docs/cve-2026-3592"
            },
            {
              "tags": [
                "patch"
              ],
              "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": "Amplification vulnerabilities via self-pointed glue records",
          "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-2026-3592",
        "datePublished": "2026-05-20T13:09:21.547Z",
        "dateReserved": "2026-03-05T12:53:33.956Z",
        "dateUpdated": "2026-05-20T13:42:21.764Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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.

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    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.