{"cve":"CVE-2026-47180","nvd":{"published":"2026-07-17T19:17:15.153","modified":"2026-08-17T19:48:30.380","status":"Analyzed","description":"Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5, DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.","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-674"],"references":["https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf","https://github.com/python-zeroconf/python-zeroconf/pull/1719","https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5","https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc-3ccv-5297"],"products":["paulsm:zeroconf"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-47180","score":0.0037,"percentile":0.3094,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9pgc-3ccv-5297","url":"https://osv.dev/vulnerability/GHSA-9pgc-3ccv-5297","summary":"zeroconf has unbounded recursion in DNS compression-pointer decoder that allows LAN-local denial of service","modified":"2026-07-13T16:43:29.652103668Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.5"],"fixed":["0.149.5"]}]},{"id":"PYSEC-2026-3436","url":"https://osv.dev/vulnerability/PYSEC-2026-3436","summary":"zeroconf has unbounded recursion in DNS compression-pointer decoder that allows LAN-local denial of service","modified":"2026-07-13T16:31:54.094137644Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.5"],"fixed":["0.149.5"]}]}],"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."]}