{"cve":"CVE-2026-48487","nvd":{"published":"2026-07-17T19:17:15.963","modified":"2026-08-17T20:06:33.250","status":"Analyzed","description":"Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, _read_character_string and _read_string in src/zeroconf/_protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self._data_len, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to send a TXT, HINFO, or A/AAAA record with rdlength=65535 and seed DNSCache and ServiceInfo.properties with truncated, attacker-shaped key/value or address records. This issue is fixed in version 0.149.16.","cvss_v4":{"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-130"],"references":["https://github.com/python-zeroconf/python-zeroconf/commit/544449596e645fcaad3834fa0cb614a54f847a82","https://github.com/python-zeroconf/python-zeroconf/issues/1752","https://github.com/python-zeroconf/python-zeroconf/pull/1756","https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.16","https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-qc2x-6f54-m6h9"],"products":["paulsm:zeroconf"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-48487","score":0.00467,"percentile":0.40448,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qc2x-6f54-m6h9","url":"https://osv.dev/vulnerability/GHSA-qc2x-6f54-m6h9","summary":"zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet","modified":"2026-07-13T16:43:20.174589479Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.16"],"fixed":["0.149.16"]}]},{"id":"PYSEC-2026-3438","url":"https://osv.dev/vulnerability/PYSEC-2026-3438","summary":"zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet","modified":"2026-07-13T16:31:54.097411215Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.16"],"fixed":["0.149.16"]}]}],"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."]}