CVE-2026-47180
Reported by github_m · Published July 17, 2026
zeroconf is fixed in 0.149.5 (PyPI)
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| zeroconf | PyPI | 0.149.5 |
| zeroconf | paulsm | 0.149.5 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| python-zeroconf | python-zeroconf | < 0.149.5 |
| PyPI | zeroconf | 0 |
| python-zeroconf | python-zeroconf | 0 |
Timeline
- May 29, 2026 CVE Published
- Jun 1, 2026 Security Advisory
- Jul 17, 2026 CVE Updated
- Jul 18, 2026 EPSS Score (27 in total, the first dated here)
Query this with the API
The same record, from the CLI:
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References
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc-3ccv-5297 x_refsource_CONFIRM
- https://github.com/python-zeroconf/python-zeroconf/pull/1719 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cf x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-47180 advisory
- https://github.com/advisories/GHSA-9pgc-3ccv-5297 advisory
- https://github.com/python-zeroconf/python-zeroconf/issues/1713 url