Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Paulsm | Zeroconf | < 0.149.6 |
Related Weaknesses (CWE)
References
- https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991Patch
- https://github.com/python-zeroconf/python-zeroconf/issues/1714Issue TrackingPatch
- https://github.com/python-zeroconf/python-zeroconf/pull/1717Issue TrackingPatch
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6Release Notes
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvxVendor AdvisoryPatch
FAQ
What is CVE-2026-47183?
CVE-2026-47183 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 _se...
How severe is CVE-2026-47183?
CVE-2026-47183 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47183?
Check the references section above for vendor advisories and patch information. Affected products include: Paulsm Zeroconf.