{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.149.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b22c8ff19c66c68907d220a4823c0950f4fa93f7"
            },
            {
              "fixed": "f4b506645d7ac4c076bd4f59550b36c607932f39"
            }
          ],
          "repo": "https://github.com/python-zeroconf/python-zeroconf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9663-mqmp-p9mm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48045.json"
  },
  "details": "Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn. This issue is fixed in version 0.149.12.",
  "id": "CVE-2026-48045",
  "modified": "2026-07-19T03:30:54.085304866Z",
  "published": "2026-07-17T18:26:19.274Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.12"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48045.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9663-mqmp-p9mm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48045"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-zeroconf/python-zeroconf/commit/b22c8ff19c66c68907d220a4823c0950f4fa93f7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-zeroconf/python-zeroconf/pull/1751"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood"
}