Medium severity6.5GHSA Advisory· Published Jul 17, 2026· Updated Aug 17, 2026
CVE-2026-48045
CVE-2026-48045
Description
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn. This issue is fixed in version 0.149.12.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
zeroconfPyPI | < 0.149.12 | 0.149.12 |
Affected products
3- Range: < 0.149.12
Patches
Vulnerability mechanics
References
5- github.com/python-zeroconf/python-zeroconf/commit/b22c8ff19c66c68907d220a4823c0950f4fa93f7nvdPatchWEB
- github.com/python-zeroconf/python-zeroconf/pull/1751nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-9663-mqmp-p9mmghsaADVISORY
- github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9663-mqmp-p9mmnvdVendor AdvisoryPatchWEB
- github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.12nvdRelease Notes
News mentions
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