{"cve":"CVE-2026-47183","nvd":{"published":"2026-07-17T19:17:15.303","modified":"2026-08-17T19:50:03.170","status":"Analyzed","description":"Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.exc_info() tracebacks whose frame locals kept raw packet self.data buffers and allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to drive memory growth until mDNS-dependent features degrade or the process is OOM-killed. This issue is fixed in version 0.149.6.","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-400"],"references":["https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec","https://github.com/python-zeroconf/python-zeroconf/issues/1714","https://github.com/python-zeroconf/python-zeroconf/pull/1717","https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6","https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5"],"products":["paulsm:zeroconf"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-47183","score":0.00389,"percentile":0.32995,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-phvx-9mgw-67r5","url":"https://osv.dev/vulnerability/GHSA-phvx-9mgw-67r5","summary":"zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion","modified":"2026-07-13T16:43:37.806701622Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.6"],"fixed":["0.149.6"]}]},{"id":"PYSEC-2026-3437","url":"https://osv.dev/vulnerability/PYSEC-2026-3437","summary":"zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion","modified":"2026-07-13T16:32:47.255768774Z","packages":[{"ecosystem":"PyPI","name":"zeroconf","purl":"pkg:pypi/zeroconf","ranges":["<0.149.6"],"fixed":["0.149.6"]}]}],"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."]}