CVE-2026-47180
Medium
Description
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5, DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.
SeverityMedium
CVSS6.5
Exploit probability—
ProductPaulsm Zeroconf
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- paulsm zeroconf0.149.5 or later
- zeroconf0.149.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| paulsm zeroconf | v < 0.149.5 | 0.149.5 |
| zeroconfPyPI | v < 0.149.5 | 0.149.5 |
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