{"cve":"CVE-2026-48045","nvd":{"published":"2026-07-17T19:17:15.820","modified":"2026-08-17T20:03:08.193","status":"Analyzed","description":"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.","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/b22c8ff19c66c68907d220a4823c0950f4fa93f7","https://github.com/python-zeroconf/python-zeroconf/pull/1751","https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.12","https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9663-mqmp-p9mm"],"products":["paulsm:zeroconf"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-48045","score":0.0037,"percentile":0.3094,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9663-mqmp-p9mm","url":"https://osv.dev/vulnerability/GHSA-9663-mqmp-p9mm","summary":"python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood","modified":"2026-07-13T16:43:42.818989308Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.12"],"fixed":["0.149.12"]}]},{"id":"PYSEC-2026-3435","url":"https://osv.dev/vulnerability/PYSEC-2026-3435","summary":"python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood","modified":"2026-07-13T16:33:27.758889164Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.12"],"fixed":["0.149.12"]}]}],"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."]}