CVE WatchAug 17, 2026

CVE-2026-47183

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four

CVSS

6.5

Medium

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Published: Jul 17, 2026 · Last modified: Aug 17, 2026 · CWE-400

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-242026-09-21

Technical 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.

Official references

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