{"cve":"CVE-2026-47184","nvd":{"published":"2026-07-17T19:17:15.440","modified":"2026-08-17T19:56:27.247","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-770"],"references":["https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4","https://github.com/python-zeroconf/python-zeroconf/issues/1715","https://github.com/python-zeroconf/python-zeroconf/pull/1718","https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7","https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2"],"products":["paulsm:zeroconf"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-47184","score":0.00389,"percentile":0.32995,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-rfg2-pjw2-56x2","url":"https://osv.dev/vulnerability/GHSA-rfg2-pjw2-56x2","summary":"zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood","modified":"2026-07-13T16:43:03.274039851Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.7"],"fixed":["0.149.7"]}]},{"id":"PYSEC-2026-3439","url":"https://osv.dev/vulnerability/PYSEC-2026-3439","summary":"zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood","modified":"2026-07-13T16:31:54.094652220Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.7"],"fixed":["0.149.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}