CVE-2026-47180CWE-674

CVE-2026-47180

Medium · published July 17, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
29.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00370 · 29.8th percentile
Weakness
CWE-674 · Uncontrolled Recursion
Published
2026-07-17T23:17Z
Affected products (1)
ProductVersionsFixed in
paulsm/zeroconf< 0.149.50.149.5
References (4)
https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf · [email protected]https://github.com/python-zeroconf/python-zeroconf/pull/1719 · [email protected]https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5 · [email protected]https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc-3ccv-5297 · [email protected]
EPSS history
Timeline
  • 17 JUL 18:21Z
    Zeroconf: Unbounded recursion in DNS compression-pointer decoder allows LAN-local denial of service
    cvelistv5