{"id":"UBUNTU-CVE-2026-48487","details":"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.","modified":"2026-08-19T13:31:49.394977769Z","published":"2026-07-17T19:17:00Z","upstream":["CVE-2026-48487"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48487"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-48487"},{"type":"REPORT","url":"https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-qc2x-6f54-m6h9"},{"type":"REPORT","url":"https://github.com/python-zeroconf/python-zeroconf/issues/1752"},{"type":"REPORT","url":"https://github.com/python-zeroconf/python-zeroconf/pull/1756"}],"affected":[{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.17.2-1","0.17.4-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.17.4-1","binary_name":"python-zeroconf"},{"binary_name":"python3-zeroconf","binary_version":"0.17.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}},{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.19.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-zeroconf","binary_version":"0.19.1-1"},{"binary_version":"0.19.1-1","binary_name":"python3-zeroconf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}},{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.21.3-1","0.23.0-1","0.24.4-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-zeroconf","binary_version":"0.24.4-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}},{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.26.1-1","0.36.11-1","0.36.12-1","0.36.13-1","0.37.0-1","0.38.1-1","0.38.3-1","0.38.3-2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-zeroconf","binary_version":"0.38.3-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}},{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.76.0-1","0.119.0-1","0.126.0-1","0.127.0-1","0.128.0-1","0.128.0-2","0.128.4-1","0.129.0-1","0.130.0-1","0.131.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.131.0-1","binary_name":"python3-zeroconf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}},{"package":{"name":"python-zeroconf","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-zeroconf?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.147.0-1","0.148.0-1","0.148.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.148.0-2","binary_name":"python3-zeroconf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48487.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}