Allocation of Resources Without Limits or Throttling Affecting zeroconf package, versions [,0.149.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published31 May 2026
- disclosed29 May 2026
- creditUnknown
Introduced: 29 May 2026
CVE-2026-47184 (opens in a new tab)How to fix?
Upgrade zeroconf to version 0.149.7 or higher.
Overview
zeroconf is a Pure Python Multicast DNS Service Discovery Library (Bonjour/Avahi compatible)
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the DNSCache._async_add. Any unauthenticated host on the local link can exhaust system memory and degrade performance by sending a flood of multicast mDNS responses with unique names, causing unbounded growth in the DNS record cache and related data structures. This can lead to process termination or severe slowdowns, especially on memory-constrained systems.
Workaround
This vulnerability can be mitigated by restricting mDNS (UDP/5353) traffic to trusted Layer-2 segments using AP client isolation, guest-network separation, or host firewall rules.