CVE-2026-47183
Description
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.exc_info() tracebacks whose frame locals kept raw packet self.data buffers and allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to drive memory growth until mDNS-dependent features degrade or the process is OOM-killed. This issue is fixed in version 0.149.6.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
zeroconfPyPI | < 0.149.6 | 0.149.6 |
Affected products
4- ghsa-coords2 versions
< 0.149.6+ 1 more
- (no CPE)range: < 0.149.6
- (no CPE)range: < 0.136.0-bp160.2.1
- Range: < 0.149.6
Patches
Vulnerability mechanics
References
6- github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcecnvdPatch
- github.com/python-zeroconf/python-zeroconf/issues/1714nvdIssue TrackingPatchWEB
- github.com/python-zeroconf/python-zeroconf/pull/1717nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-phvx-9mgw-67r5ghsaADVISORY
- github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5nvdVendor AdvisoryPatchWEB
- github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6nvdRelease Notes
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