CVE-2026-47183

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductPaulsm Zeroconf

PublishedJul 17, 2026

First seenJul 17, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update

paulsm zeroconf0.149.6 or later
zeroconf0.149.6 or later

Affected products

Product	Affected versions	Fixed in
paulsm zeroconf	v < 0.149.6	0.149.6
zeroconfPyPI	v < 0.149.6	0.149.6

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