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PYSEC-2026-3439 zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood

🗓️ 13 Jul 2026 15:19:14Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 1 Views

Impact DNSCache._async_add inserted every response record into cache, _expirations, _expire_heap, and service_cache with no cap on entry count. The only pre-existing protection was a PTR TTL floor (_DNS_PTR_MIN_TTL = 1125 s, RFC 6762 §10), which a...

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13 Jul 2026 16:31Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.16.5
EPSS0.00023
1