Medium severity6.5GHSA Advisory· Published Jul 17, 2026· Updated Aug 17, 2026
CVE-2026-47180
CVE-2026-47180
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
zeroconfPyPI | < 0.149.5 | 0.149.5 |
Affected products
4- Range: < 0.149.5
- ghsa-coords2 versions
< 0.149.5+ 1 more
- (no CPE)range: < 0.149.5
- (no CPE)range: < 0.136.0-bp160.2.1
Patches
Vulnerability mechanics
References
6- github.com/python-zeroconf/python-zeroconf/commit/f9e23592137f30fdf7ef710dba065da31c79b1cfnvdPatch
- github.com/python-zeroconf/python-zeroconf/pull/1719nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-9pgc-3ccv-5297ghsaADVISORY
- github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9pgc-3ccv-5297nvdVendor AdvisoryPatchWEB
- github.com/python-zeroconf/python-zeroconf/issues/1713ghsaWEB
- github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.5nvdRelease Notes
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