CVE-2026-47183mediumCWE-400

CVE-2026-47183: medium-severity vulnerability in python-zeroconf

Zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion

Published

Follow this CVE+ Monitor python-zeroconf+ Monitor python-zeroconf

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.5epss 0.4%
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:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
python-zeroconf · python-zeroconf
Related CVEs — python-zeroconf

In the same product, most dangerous first.

CVE-2026-48487MEDIUMZeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packetEPSS 0.5%CVE-2026-47184MEDIUMZeroconf: Unbounded DNS record cache allows LAN-local memory exhaustion via multicast floodEPSS 0.4%CVE-2026-48045MEDIUMZeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source floodEPSS 0.4%CVE-2026-47180MEDIUMZeroconf: Unbounded recursion in DNS compression-pointer decoder allows LAN-local denial of serviceEPSS 0.4%