Security advisory

{
  "id": "0b2481b8d0446aab3231bf846bb22e85516d331b55230453ead18a9760e4c4e8",
  "url": "https://osv.dev/vulnerability/CVE-2026-19538",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-19538",
    "summary": "The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.",
    "evidence": "osv:CVE-2026-19538",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-19538",
      "aliases": [
        "CVE-2026-19538"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nlnetlabs/nsd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f96f83fa834d970e63b77f261a7189065291043c"
                },
                {
                  "fixed": "a06e6ce15b11a18b2c7eddbf3a8053696c7fd28e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.8.0"
                      },
                      {
                        "fixed": "4.15.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "NSD_4_15_0_REL",
            "NSD_4_15_0_RC1",
            "NSD_4_14_2_REL",
            "NSD_4_14_2_RC1",
            "NSD_4_14_1_REL",
            "NSD_4_14_1_RC1",
            "list",
            "NSD_4_14_0_RC1",
            "NSD_4_12_0_REL",
            "NSD_4_13_0_REL",
            "NSD_4_13_0_RC1",
            "NSD_4_12_0_RC1",
            "NSD_4_11_1_REL",
            "NSD_4_11_0_REL",
            "NSD_4_11_0_RC1",
            "NSD_4_10_1_REL",
            "NSD_4_10_1_RC2",
            "NSD_4_10_1_RC1",
            "NSD_4_10_0_RC1",
            "NSD_4_9_0_RC1",
            "NSD_4_8_0_REL",
            "NSD_4_8_0_RC1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19538.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:32.676607866Z",
      "provider": "osv",
      "references": [
        "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-19538",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 433087,
  "published_at": "2026-08-26T09:16:46.057+00:00"
}