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 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 v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec	Patch
https://github.com/python-zeroconf/python-zeroconf/issues/1714	Issue Tracking Patch
https://github.com/python-zeroconf/python-zeroconf/pull/1717	Issue Tracking Patch
https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6	Release Notes
https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5	Vendor Advisory Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:paulsm:zeroconf:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-07-17 19:17

Updated : 2026-08-17 19:50

NVD link : CVE-2026-47183

Mitre link : CVE-2026-47183

CVE.ORG link : CVE-2026-47183

JSON object : View

Products Affected

paulsm

zeroconf

CWE

CWE-400

Uncontrolled Resource Consumption

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