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PYSEC-2026-3435 python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood

🗓️ 13 Jul 2026 15:46:16Reported by GoogleType 
osv
 osv
🔗 osv.dev

Impact AsyncListener.handle_query_or_defer retained every truncated (TC-bit) incoming query in self._deferred[addr] and armed a per-addr timer in self._timers[addr] that flushed the reassembled query within ~500 ms (RFC 6762 §18.5). Neither the pe...

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13 Jul 2026 16:33Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.16.5
EPSS0.00018
0