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.
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Thu, 23 Jul 2026 21:45:00 +0000
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Python-zeroconf
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Sat, 18 Jul 2026 17:30:00 +0000
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Fri, 17 Jul 2026 18:45:00 +0000
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| 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. | |
| Title | Zeroconf: Unbounded recursion in DNS compression-pointer decoder allows LAN-local denial of service | |
| Weaknesses | CWE-674 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-07-17T18:21:25.199Z
Updated: 2026-07-17T19:21:29.700Z
Reserved: 2026-05-18T22:07:37.434Z
Link: CVE-2026-47180
Updated: 2026-07-17T19:21:25.872Z
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