Uncontrolled Recursion Affecting zeroconf package, versions [,0.149.5)
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-2026-47180 (opens in a new tab)How to fix?
Upgrade zeroconf to version 0.149.5 or higher.
Overview
zeroconf is a Pure Python Multicast DNS Service Discovery Library (Bonjour/Avahi compatible)
Affected versions of this package are vulnerable to Uncontrolled Recursion via the DNSIncoming._decode_labels_at_offset function. An attacker can cause excessive CPU consumption and log flooding by sending specially crafted mDNS packets with a long chain of unique forward compression pointers, leading to unbounded recursion and service degradation. This can be performed by any unauthenticated host on the local network segment using UDP/5353 multicast.