{"id":"CVE-2026-47184","summary":"Zeroconf: Unbounded DNS record cache allows LAN-local memory exhaustion via multicast flood","details":"Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.7, DNSCache._async_add inserted every response record into cache, _expirations, _expire_heap, and service_cache without a cap, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to multicast valid mDNS responses with unique names and cause memory exhaustion, slower cache lookups, slower async_expire passes, and broken discovery, registration, and ServiceBrowser callbacks. This issue is fixed in version 0.149.7.","aliases":["GHSA-rfg2-pjw2-56x2","PYSEC-2026-3439"],"modified":"2026-07-19T03:47:20.020263277Z","published":"2026-07-17T18:25:07.387Z","related":["openSUSE-SU-2026:21175-1"],"database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47184.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47184.json"},{"type":"ADVISORY","url":"https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47184"},{"type":"REPORT","url":"https://github.com/python-zeroconf/python-zeroconf/issues/1715"},{"type":"FIX","url":"https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4"},{"type":"FIX","url":"https://github.com/python-zeroconf/python-zeroconf/pull/1718"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-zeroconf/python-zeroconf","events":[{"introduced":"0"},{"fixed":"0ad3f37b5b852b8f614d322283d148efb2cef6e4"},{"fixed":"e32f52d69d838ec1d2e97856a786691eaa6a4632"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.149.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["0.149.6","0.149.5","0.149.4","0.149.3","0.149.2","0.149.1","0.149.0","0.148.0","0.147.4","0.147.3","0.147.2","0.147.1","0.147.0","0.146.5","0.146.4","0.146.3","0.146.2","0.146.1","0.146.0","0.145.1","0.145.0","0.144.3","0.144.2","0.144.1","0.144.0","0.143.1","0.143.0","0.142.0","0.141.0","0.140.1","0.140.0","0.139.0","0.138.1","0.138.0","0.137.2","0.137.1","0.137.0","0.136.2","0.136.1","0.136.0","0.135.0","0.134.0","0.133.0","0.132.2","0.132.1","0.132.0","0.131.0","0.130.0","0.129.0","0.128.5","0.128.4","0.128.3","0.128.2","0.128.1","0.128.0","0.127.0","0.126.0","0.125.0","0.124.0","0.123.0","0.122.3","0.122.2","0.122.1","0.122.0","0.121.0","0.120.0","0.119.0","0.118.1","0.118.0","0.117.0","0.116.0","0.115.2","0.115.1","0.115.0","0.114.0","0.113.0","0.112.0","0.111.0","0.110.0","0.109.0","0.108.0","0.107.0","0.106.0","0.105.0","0.104.0","0.103.0","0.102.0","0.101.0","0.100.0","0.99.0","0.98.0","0.97.0","0.96.0","0.95.0","0.94.0","0.93.1","0.93.0","0.92.0","0.91.1","0.91.0","0.90.0","0.89.0","0.88.0","0.87.0","0.86.0","0.85.0","0.84.0","0.83.1","0.83.0","0.82.1","0.82.0","0.81.0","0.80.0","0.79.0","0.78.0","0.77.0","0.76.0","0.75.0","0.74.0","0.73.0","0.72.3","0.72.2","0.72.1","0.72.0","0.71.5","0.71.4","0.71.3","0.71.2","0.71.1","0.71.0","0.70.0","0.69.0","0.68.1","0.68.0","0.67.0","0.66.0","0.65.0","0.64.1","0.64.0","0.63.0","0.62.0","0.61.0","0.60.0","0.59.0","0.58.2","0.58.1","0.58.0","0.57.0","0.56.0","0.55.0","0.54.0","0.53.1","0.53.0","0.52.0","0.51.0","0.50.0","0.49.0","0.48.0","0.47.4","0.47.3","0.47.2","0.47.1","0.47.0","0.46.0","0.45.0","0.44.0","0.43.0","0.42.0","0.41.0","0.40.1","0.40.0","0.39.5","0.39.4","0.39.3","0.39.2","0.39.1","0.39.0","0.38.7","0.38.6","0.38.5","0.38.4","0.38.3","0.38.2","0.38.1","0.38.0","0.37.0","0.36.13","0.36.12","0.36.11","0.36.10","0.36.9","0.36.8","0.36.7","0.36.6","0.36.5","0.36.4","0.36.3","0.36.2","0.36.1","0.36.0","0.35.1","0.35.0","0.34.3","0.34.2","0.34.1","0.34.0","0.33.4","0.33.3","0.33.2","0.33.1","0.33.0","0.32.1","0.32.0","0.32.0rc7","0.32.0rc6","0.32.0rc5","0.32.0rc4","0.32.0rc3","0.32.0rc2","0.32.0rc1","0.32.0b6","0.32.0b5","0.32.0b4","0.32.0b3","0.32.0b2","0.32.0b1","0.29.0","0.28.8","0.28.7","0.28.6","0.28.5","0.28.4","0.28.3","0.28.2","0.28.1","0.28.0","0.27.1","0.27.0","0.26.3","0.26.1","0.26.0","0.25.1","0.25.0","0.24.5","0.24.4","0.24.3","0.24.2","0.24.1","0.24.0","0.23.0","0.22.0","0.21.3","0.21.2","0.21.1","0.21.0","0.20.0","0.19.1","0.19.0","0.18.0","0.17.7","0.17.6","0.17.5","0.17.4","0.17.3","0.17.2","0.17.1","0.17.0","0.16","0.15.1","0.15","0.14","0.13"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47184.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}